What's your opinion on these words?

A couple of days back someone said this to me, I'm wondering what others have to say about this from their personal experiences:

You'll always find a replacement for a guy (ex). You'll find an older guy (like your ex), you'll find a younger guy (like your ex), you'll find a similar aged guy (like your ex). You'll even find someone who's better than him. But you'll never find a replacement for a girl (ex). You'll find different types of girls, but never anything what was already there.

Whats your opinion on these words?
What's your opinion on these words?
Post Opinion