It's all about feedback. Look at oral for example, some women like you to grind your face into their cunt, aggressively sucking or even biting their clit while others go wild for the lightest touch, never even focusing directly on it and find anything more painful and/or distracting. You need to read the situation. Sex is also much more fun if you are totally 'there'. I spent several years at the end of my marraige fantasising about other stuff during sex, not healthy and not good for the enjoyment of either of you.
I consider myself very lucky in that my current girlfriend was very critical if I didn't do everything exactly right for her (she'd even tell me if I was stroking her arm in a 'slightly irritating way' as we watched TV), it was a pain in the ass for a while but caused me to adjust aspects of my personal bag of tricks that i'd never even considered.
I know i'm not talking about actual fucking here but at the end of the day that's fairly simple. My 'studliness' in that department usually consists of a woman appreciating, to a greater or lesser extent, my inability to cum easily (which masquerades quite well as fairly impressive stamina) and my girth (my length rarely gets a compliment).
The other stuff, oral technique, other foreplay, the way you talk during sex makes far more difference to most women and, in my case at least, had far more of an impact on my own sexual confidence.
It's kind of nice to be in a position that when it comes down to sex, i'm very confident that I can show a woman a good time, if not in absolute terms then at least be a surprisingly good fuck for an old fat bloke
