Most Helpful Guy
A guy does not have any problem with this whatsoever. But, if you have been friends for a while and the guy never asked *you* out, it's possible he isn't attracted to you in the first place.
Were you definitely "just friends" in such a way that he would not have asked you out before? Do you not know each other that well? Were there other circumstances preventing a relationship (like he wasn't single)?
Again, guys have zero problem with a girl asking them out. But, realize that it's very rare for a guy to have an eligible girl around him that he doesn't consider. And if he finds that girl attractive he'll usually at least explore the possibility (some guys do this even when they're not single).
You should definitely go for it but be aware of the above.0THIS IS NOT RELEVANT ANYMORE