considering i'm a pretty hairy guy to begin with, at most, i trim occasionally. we still have hair there for a reason, keeps the chafing down, and i like to wear boxers, so its often skin on skin and the hair is a good buffer. tried a really short trim once and it felt really weird, and i did end up nicking a ball which both hurt like hell and bled more than expected. it also looked weird with that area trimmed shorter than the hair on my stomach and legs. and it poked my skin growing back, also not that pleasant.
as for the other sex, i'm not picky and don't mind bush. unclean is unclean, shaved, trimmed or natural. i guess it is a little nicer for it to be trimmed, but i'm not a hypocrite either. if she puts up with my hair, i can put up with hers. it also matters less when you're not trying to make an impression, as i'm married. and girls shaved completely can look 'young' if certain body types; i'd prefer a little than none at all.