Do women like men wearing g strings?

That depends on the guy, and the situation. Guys who are looking just for an easy woman see a g-string as a good indication that a woman will be easy to get in bed with. Other guys see them as sexy, but not something to choose a woman because of. Personally, I believe when it's obvious that a woman is wearing one, it makes her look cheep, but when used on an occasional basis as a surprise that I see only when her pants come off, it's a turn on.