It's either sexy or slightly creepy depending on the context. I don't think I'd ever consider it funny though.
Same thing I thought lol
If you've been with the person a long time and are sexual then it's really hot, if not then it's not really something that's going to turn me on otherwise, and it might just put them in a the creepy factor.
The only helpful thing I ever read in Cosmo was to watch a person masturbate before trying to get them off, that way at least you have an idea of what they like. I think it's sexy to watch someone get off!
Well...that depends! I love to watch my Phil get himself hard, I love it when he comes, the bit between those to points gets a bit tedious! As for seeing men in general play with themselves, yes it can be a turn on, but to be honest it can be quite comical too! Sorry if that sounds like a cop out!