I had a relationship for about six years in which we were mutually worshipful of each other's bodies, which was extremely satisfying. We could make out for very long periods of time, running our hands over each other's bodies. I would blow him at length, working my eyes, hands, and mouth on his dick and his balls. I would suck his cock until I lost all feeling in my lips, part of my throat, my jaw, my cheeks, and my tongue would be tender where I was getting to much friction from the barbell in my tongue. Then I would just lick his whole package: head, shaft, balls, taint, stroking with my hands, caressing with my tongue until my mouth and lower face were comfortable again. Sometimes he'd come in my mouth, after I'd swallow, he'd return the favor. He would encourage me, after I'd climax, to just take a nap and let him keep going. I would nap, and he'd lick my ass until I woke up again. I'd usually wake up again when he'd start licking my clit, which he'd do until I was really horny, and THEN he'd finally fuck me. Sure, we didn't have time for mutual body worship every time we had sex (especially since we had sex usually four times a week) but we did do it that way very often, making love to each other for hours, stopping only after we'd both come twice. But what makes me think of it as worshipful is the way he'd get very dominant while I was sucking his cock, verbally insisting that I try harder, push myself further, take more of him into my mouth, be a good girl and show him how much I loved his cock, etc. Also, the way he'd be so gentle, but still keep eating me after I came, deliberately lull me to sleep, and still be going when I'd wake up, and then pound the hell out of me. Very, very intense.
There was one other instance. After that lover broke my heart, I was having sex with the only other man I've been with whose penis was as thick as his, and I'd somehow get my body to accommodate the second man's in ways it never accommodated the first's no matter how hard I'd tried. I used to stuff his cock into my throat so easily, and I couldn't get enough of deep-throating him. I still get wet even right now, my heart is beating faster, and I can almost smell him thinking about the feeling of his cock completely buried in my mouth. I was never, ever able to get the head of the first guy's into my throat, not once. I also never got more than the head into my asshole, and even then, only once, and for a few seconds before I had to insist he stop. We tried for six years to have anal sex. I loved anal sex with a previous partner, yet this guy just would not fit. Nonetheless, I used to beg guy #2 to fuck my ass, and I never had any difficulty getting him in, or keeping him in until he came. The heads of their penises were different shapes, but the same size, and their shafts were the same size. I was definitely in a trance-like state sometimes when exploring the body of guy #2. I was so hot for him. I loved him too, though not as much as I loved the first guy. I was more lustful for guy #2, though, and gave more of my body to him, and I always wonder if it was some kind of personal, private revenge against guy#1 for completely letting me down and breaking my heart.
Still, I suppose it could have been the shape of his cockhead, or changes in my own body...