Dunno if it´s better for sex, but mine is straight:

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Mine is curved up when fully erect but I am not conscious of the bend when wanking (probably because it is short). But when it comes to wanking another guy, I like his cock to be straight (and preferably thin and long).
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Depends on the position for me. If I'm on my back with my legs up, I love a long (but not too thick) dick that curves down. I prefer to take straight or upward curves in doggy.

Those that curve left or right I can accommodate in almost any position.

a good upward curve is the best g spot hitter ever, l know it makes me blow heaps *lix*

Mines got a fantastic left curve which is really prominent when erect.
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/image/pfh9xhqheiqp_308705194.jpg How is my shape

mine is very straight

mine is curved down when fully hard and i always wanted to have a straight cock but i am more than happy about the length, the position for me that works best is from behind in her pussy

Curved 6-8 inches long, 5-6 inches at thickest. Great for looking at. Also with dark chestnut pubic bush - typical middle European - what a gorgeous sight !