When I first saw this thread, I have to admit, I was offended that the OP appeared to think that men in general are so weak willed and such slaves to their hormones that the only thing that prevents them from fucking every person that they can is whether or not someone wants to fuck them, too, which is what the question implies, that given good looks and a large dick, men wouldn't want a relationship, when clearly the motivation to want a relationship or not is unrelated to whether or not a man has a lot of opportunities to have a lot of sex. It was this concept that I responded to. I should have been clearer in my earlier posts to prevent misunderstanding, but I wasn't intending on writing the most comprehensive response possible, but merely responding to the OP, whose concerns regarded men who get around a lot and are womanizers because they are attractive and hung, which make those guys shallow and men of bad character. It is entirely possible to be promiscuous without being a womanizer, which implies a man who is manipulative and hurtful. It's possible to be an ethical slut, as anyone who has read my posts probably already knows. I don't believe that someone who chooses promiscuity or to be single is a person of bad character. As Nudeyorker pointed out, there are many reasons why a man might not want a relationship that have nothing to do with shallow reasons or bad character. By arguing against the implications in the OP, I believe I inadvertently implied that people who did not want a relationship for non-shallow reasons, like Nudeyorker, have a bad character, which wasn't my intention.
Regarding personal experience, I don't personally know anyone who would be considered attractive by general consensus who reached the age of 28 without ever having been in a LTR, which was another concern of the OP. I just don't know anyone like that. I know attractive men and women who have said they weren't interested in a relationship for a periods of time in their 20s, but by the age of 28 they had had one or more serious relationships.
My hubby and I were discussing the 10% statistic and the assumption that those who are the sluttiest must be the most attractive and hung. Looking at our friends, we think that assumption may be wrong because the list of heterosexual men we know who get around the most isn't the same list of hetero men we would consider to be the most desirable from a "one night stand" perspective, such as being the sexiest in appearance when naked. There are a few crossovers, but very few, like my first love, who was gorgeous and charming and a true man-whore when he was single, and he rarely was single, but even then I wouldn't consider him to be womanizing because he was genuinely interested in the women he seduced and always motivated by a need for validation that he was desired, and he did not treat women like objects. I could not fall in love with an actual womanizer. He always seemed to think that the next woman who came along was better than the last one, and he was often wrong and regretted it, but it took him a very long time to learn that lesson.
This is interesting, in regards to penis size and promiscuity. My ex who has the smallest penis, he's actually one of the guys I know who would be considered attractive who was more promiscuous than the average man. He has a very low self-esteem and I know that hotly pursuing anyone who shows the slightest bit of interest in him and sleeping around a lot is a symptom of his low self-esteem, that need for validation, so that motivation has resulted in him being one of the more successful men I know in terms of seducing women. He's a good example of how penis size is unrelated to seduction ability of a man because women don't discover the size of a man's penis until she's ready to have sex with him. It's also resulted in some humiliating experiences for him, but he obviously hasn't let his feelings about his endowment prevent him from getting involved with women. That attitude appears to be more important for success with women than penis size.
Now, I've mentioned two men who sought out validation from their promiscuous behavior, so I feel I must make a disclaimer, lest I be misunderstood. I am not implying that everyone who likes to have a lot of sex with a lot of partners has a low self-esteem or needs validation, but that was the case with the previous two men I wrote about.
I do have another friend who almost fits the description in the OP, sort of, and I don't think his behavior had anything to do with validation. He was promiscuous because he enjoyed the fun of sleeping with a lot of women and he wanted to enjoy the freedom of being single. He was attractive and fun and cool and talented, being the guitarist in a band, so he had little trouble seducing women. I would consider him to be an ethical slut because he was always completely honest about his disinterest in relationships, which he always made clear before he slept with them and he tried to remain on good terms with the people he'd slept with. He doesn't fit the OPs description perfectly because his "slutty" period came after he had already been in a LTR that fell apart, and he was slutty for only a few years before he fell in love with a woman, married her, and had two wonderful children whom he adores and who are now the joys of his life. I think he was 27 when he got married. In the past 10 years, he's become a wonderful man, which I would not have expected when I knew him when I was in my early 20s (he's older than me).
My hubby and I were talking about this a lot last night, and the guy we know who is more successful with women than any other man we know consistently over the past 12 years, he's an ordinary looking guy. It's been a subject of frequent discussion between my hubby and me and other friends. He's not tall, in fact he's a little under average height, he's not at all financially successful, or extremely intelligent, or very talented, he has a bit of a pot belly and he's never been muscular, and I personally don't consider him to be an attractive guy. I don't think he's hung because I've known him since he was 16 and he's slept with enough women I know that I think I would have heard if he's hung by now, since he has slept with quite a few indiscreet women over the years. Yet this guy is constantly being chased by women. We're all the time asking each other, for over a decade now, amazed, "How does he do it?" I've actually speculated that maybe he crossed some sort of threshold where other women know how much he's pursued and feel competitive over him because of it, that he's desired because other women desire him. I know that's reaching really far for an explanation, but it seems as plausible as any other explanation because I don't understand his appeal to other women. He's not my idea of what a Casanova would be like, but maybe that's a part of his success since women aren't on guard around him, or maybe they don't feel like he's being manipulative because he seems like such an ordinary guy, and he isn't manipulative and he really is an ordinary guy. I really can't understand it since I've never felt the slightest bit sexually attracted to him. When my friends were hotly pursuing the man who is now my husband, I understood his appeal, obviously, but this guy? As a woman who is immune to whatever sex appeal he has to other women, my curiosity has led me to speculate a lot. He does have a nice personality, but he's not especially smooth. In fact, he's putting his foot in his mouth all the time. He doesn't seem to have a very good self-esteem, and I've had to talk him down before when he's become upset over the state of his life, which is a mess, and when he's feeling like a loser. He is very fun to hang out with and he's funny and he's easy to talk to. He doesn't burn bridges with people he's been involved with so there's very little bad blood between himself and other people. I suspect that the most important factor is how social he is and how much he parties, which brings him into proximity with more women who are attracted to him. He has more friends than almost anyone I know and he attends a lot of parties where there is a lot of alcohol, which probably makes it a lot easier. I don't consider him to be a womanizer either, because his heart is always becoming involved and his interest in women is genuine, but he's always looking for the next best thing, thinking that the next woman will be better than the one before, and that belief makes it a lot easier for him to move on from his last interest and on to the one he met tonight. He doesn't exactly fit the OP's worries either, even if one were to ignore the "hung" and "attractive" part, at least from my perspective, because he also keeps getting into LTR with women, for a few years at a time a few times. He's just very bad at fidelity and saying no when a new woman shows interest in him.
Now that I think about it, most of the men I know who get around the most are Rob Gordon from High Fidelity. I've never realized that before this very moment and I wouldn't have realized it at all if I hadn't written the word, "fidelity." I've known so many Rob Gordons!
I think people tend to think in simple stereotypes, like the smooth handsome hung womanizer, or the loser with women who has a small penis or who looks like The Average Man, but the real people I know don't fit into those molds.
Anyway, I doubt anyone will read this entire post because of it's length and the meandering nature, but it's been fun remembering things I had forgotten.