I think the OP means "permeates" the air, not perforates the air.
As for her leaving them behind, or "forgetting them" - the other replies are on point, she's leaving you a souvenir/marking her territory.
I've had this happen to me once - I even told the girl at the time when we met up again & she just smiled. Good times.
As for the stains or smell, she's a human being, just like when you leave your sweaty gym clothes in the hamper, the bacteria will feast on the secretions/oils.
You can either:
A) let her know & give them back
B) throw them out
C) wash them & keep them
D) wash them, then give them back
E) leave them in the state they're in, Ziploc bag them, & store them away in your "conquest" box
F) Sell them to some Japanese panty vendor. They have those vending machines, remember?
Your choice.
As for her leaving them behind, or "forgetting them" - the other replies are on point, she's leaving you a souvenir/marking her territory.
I've had this happen to me once - I even told the girl at the time when we met up again & she just smiled. Good times.
As for the stains or smell, she's a human being, just like when you leave your sweaty gym clothes in the hamper, the bacteria will feast on the secretions/oils.
You can either:
A) let her know & give them back
B) throw them out
C) wash them & keep them
D) wash them, then give them back
E) leave them in the state they're in, Ziploc bag them, & store them away in your "conquest" box
F) Sell them to some Japanese panty vendor. They have those vending machines, remember?
Your choice.