I curve a little upward when erect but I doubt it has much of an effect versus being straight. I do know that missionary is the best position for me. Cowgirl is fine as long as she doesn't lean back to far as that can hurt. If she lays on top of me I can hold her to my chest and push in deep but at my age I don't have the stamina to maintain this for long. Reverse CG isn't that good as she will bend my cock down when she inserts it fully causing discomfort also. Spooning is another good position for me but my partner has to have a tiny ass for me to stay in her vagina this way. Scissors is okay but it can be uncomfortable for her as my cock seems to pull her vulva to the side. Canine is next best and if I can get up over her the bottom of my cock will push forward in her vagina. But all of my partners, past and present, tell me they like missionary with me the best.
Depends upon what the rest of the penis is like. Doesn't really matter much if its substandard elsewhere.
I have a slight curve, so I asked my wife if she noticed any real difference between my curved one and the straight ones she has experienced. She said they all felt the same to her, but she only had missionary with the straight ones.
I always thought that you had to be in a mood for sex, rather than worrying about what position you are in. Oh well..........Silly Me.........
My girlfriend always like to be mounted and fucked up her ass,we both like that position although she likes her legs right back so that she can see my shaft entering her and i like looking at her face of satisfaction
Are we talking an upwards curve, downward curve, or sideways curve? It would seem once it's inside it's all the same. But it would be an interesting experiment.