Most Helpful Guy
Guys wants a natural beauty who doesn't use too long time at preparing herself and guys dislikes false advertisement. Some doesn't like kissing someone with makeup because it's uncomfortable and other thinks natural looks better. It depends from guy to guy.
Most Helpful Girl
Because then at least guys know what they're dealing with. Like... then they know she's attractive because they'll have found her attractive in her natural state and not in some made up pretend "enhanced" state.