May seem like a pointless poll, but we need polls! And I am interested in seeing the results.
Also, please mention what hand you masturbate with.
My penis has always curved upwards, but a few years ago I noticed that it curves to the left, too, hence: "curves up & left"
I am right handed, and always masturbated with my right hand. This is why I think my penis is curved.
I think many people have penises curving upwards because of humping the mattress when they were younger. I'm talking wet-dream age. This occurred to me lately, since I have begun humping the mattress again (yay PE!), and I realized that this could very easily cause a curve over time.
I don't mind my curve, and neither should anybody mind theirs. I've never had complaints.