Why do Ladies throw Thongs and other underwear at Male singers on Stage?

What’s the psychology behind it?

Music is a sort of dream architecture which passes in filmy clouds and disappears in nothingness —Percy A. Scholes

While dancing to the music, ladies start dreaming that they are sharing the same bed with the male singer who is performing on the stage. The rest is all about it because they can. women tend to get carried away when it comes to famous people so i guess throwing their underware and bras is a way of showing it.