For me the abdominal hair has to match the amount of chest hair. I dated a guy who had a hairy chest, so the amount of hair on his stomach wasn't a problem. I've also dated a guy with no chest or abdominal hair and I didn't have a problem with that. My current SO has minimal chest hair so his happy trail is perfect for the amount of chest hair.
I'm a moderately hairy guy. Not Robin williams hairy, but plenty. back too. heck, all over. Some days I just want to wax it all off. I don't like to trim because that itches (I've tried). all or nothing.
I really don't mind hair on my men. It doesn't bother me at all. My boyfriend really doesn't care if I happen to not shave my legs, which is a big relief because sometimes I just don't feel like it. I would not up and demand that he shave his body or wax because I think that is a very personal choice.
I don't mind hair on men (it's what makes a man a man after all lol.) but my boyfriend says he does not like hair on himself and shaves it all off except his legs. He does body building so he likes to show off his muscles in the best light possible.
Those that are attacted to men, would you like your partner's stomach with or without hair?
My SO is very hairy. I started dating him when we were 16 and he was not very hairy. These days he likes to joke that his happy trail starts under his nose. I love him and find him very sexy so I've learned to embrace the hair.
Mis-read part of the poll question, as I'm not attracted to men personally... But my answer is more what I prefer for myself.
I have mixed feelings about my body hair, maybe it's like sammm commented... we don't start off with so much hair and it grows in later. But will say that I trim my chest, stomach, and pubic hair to keep it a more manageable length. This requires less regular work compared to getting rid of all the hair, but also makes me cooler than allowing it to grow wildly. This is the main reason for me to worry about it as I tend to overheat easily and having lots of chest hair, especially during the summer only makes it worse.