Whilst I can understand that some guys would want to take home a 'trophy' of knickers or stockings/tights, I wouldn't dare to do it myself.
If the missus found them I would either need to come clean, or 'confess' to a fetish of wearing women's underwear
I'm single, and stay on my own, so no need to worry about anyone finding underwear that doesn't belong to me
Over the years, have seen a few escorts, and one thing I have always done, was after removing her panties, was to smell them, and if I liked the feel and smell, would offer to buy them for depending on what they might cost the escort to buy
So a cheap pair of knickers for £2 from Primark, would offer her £5, and most times they would accept