I have a downward curve but juts straight out. The hump should be rubbing the g spot in missonary style. I don’t see why you should be too concerened if it curves up or down. A curve down should be g spot useable in doggy style. I’ve always wondered myself why someones penis curves one way or the other. My theory is genetic disposition, tight briefs or heavy fat pad during puberty or trauma. Also its possible that nature selected either curve depending on what the women of that culture desired or the better penis to reach the cervix for insemination. Here is a survey of jackinworld.com users it also tries to see if the age of which one started masturbation can affect this and whether or not it affects the hand used for masturbation. Check 25.