Beastiality, extra terrestrial, necro.
No seriously, I always thought sex had to be long lasting, vigorous, kinky and uninhibited to be the best it could be. As someone who had pre e I never experienced that sobre, so always had to utilise whatever I could to achieve that. But when I got with my first serious gf ( a girl who couldn't take long, hard sessions) I realised it didn't have to be that way all the time and I could get as much sometimes better pleasure from those.
With my current gf it's been the best I've had, short sessions long sessions, hard, soft, sensual with no actual sex. So what defines good sex, great, is her although I don't have a plethora of experience to go by or compare, I doubt seriously I'd have this level with anyone else.
And sometimes a bit of roleplay/dom.