The gender of this name doesn't really matter to me; I hate it either way. It sounds so whiny, pretentious (or faux-pretentious), and artificial to me. It's a wet tissue of a name.
Unlike names like
Kelsey and
Stacy, which I really love for boys and associate more with boys,
Lindsay /
Lindsey does seem immediately feminine to me, in that fake perky pom-pom girl type way. On a boy, I have a vague cowboy image, but he's really just a loser trying to be a cowboy in modern day Manhattan and all he's accomplishing is choking himself with his polka-dotted neckerchief and poking himself with his own spurs.
If you were to use it, though, I don't imagine you'd get many negative comments, except perhaps that it's a bit dated.