Note: I am not a teenage girl, so take my answer with a pinch of salt (why I was A2Ad is beyond me).I'd not imagine that it's going to make much of a difference.His size worked well for me because it didn't hurt, but it was big enough that I could feel everything.The worst case scenario is when a guy is too big and you can't really fool around with different positions because everything hurts.
I'd go as far as to say men care about this facet more than women do.
To answer the original question, the best sex I've ever had was with a penis that was approximately seven inches long.
Well, I'll have to say it's my husband, but only because he's learned how to use it.
His adequate size combined with his lovemaking skills took me over the edge.
So much, in fact, that I made sure we secured a FWB relationship.
I'm not sure If it has to do with his size or the fact that our connection makes it so intense, but I do know he's all pleasure.