Don't want to fetishize them. But I never thought about this until I met this guy who is now my best friend - you could call us friends with benefits. Anyway, the sex is great - we go on for 2-3 hours - just short bathroom breaks in between. It's the best sex I've ever had TBH- and I've had a lot of sex - but then again, I think what makes it great is because I genuinely care for the person. Physically though, I think the vagina's anatomically structure is perfect to pleasure the penis - natural lubrication, fleshy stimulation inside. I dunno what else you wanna know. Ask away.