A player is someone who is detached, meaning he or she doesnt care much about the partner, which doesnt imply he or she sleeps around. A womanizer is a man (never heard a woman be called that) who sleeps around.

Can a player really fall in love?

A player can only fall in love in a very special circumstance. The characteristic of a player is that he sleeps with a lot of women. But that doesnt mean that a player cannot fall in love. After all, players are only human.