OK so as a teenager I was versatile but in my early twenties I realised I was basically a non-versatile top. Part of the reason for that, along with a variety of others, was that I found it difficult to get sexual pleasure from being fucked, I would loose my erection and couldn't cum with a dick in my arse. On top of that I prefer to be dominant in the sack and crave men's arses like an addiction and I'm essentially an alpha sexual personality, bottoming somehow didn't stimulate me or press my buttons much. Basically I'm just a natural dominant top. However over the years I've met bottoms who say that unless they're getting fucked and have something (a dick, a dildo, a fist, whatever) in their arse they simply don't get pleasure from sex, one or two have said they can't cum satisfactorily without being fucked. Is this common? I mean how do you know you're a non-versatile bottom and that you're only going to enjoy sex if you're being fucked? How much of being a bottom is actually a physical thing and how much is psychological? How does this balance of physical and psychological factors influence what kind of bottom you are? If it's a purely physical thing, you just can't cum without a dick in your arse, does that mean you're as likely to be a power bottom as a passive or submissive bottom? And if it's primarily a psychological turn on to be topped is it more likely you'll be submissive or passive? Does how much of you're pleasure is physical or psychological play a part in this kind of difference at all?