a key that opens many locks is a
master key. (from a demotivational)
anyways, the issue is deeply rooted with primal human behavior. The alpha-male is able to mate with (or choose its mate) the females in the pack. The more females a male is able to procreate with means the male has more offspring which is the basic purpose of life.
with that said though, I don't really "admire" them, maka pangutana lang ko why and how out of curiosity.
BTW Wilt Chamberlain said shortly before his death:
“With all of you men out there who think that having a thousand different ladies is pretty cool, I have learned in my life I’ve found out that having one woman a thousand different times is much more satisfying.”