I'd have thought pants with no crotch would be the least likely to cause thrush.....
Anyway.
I'm really surprised by some of the replies here.
I knew there were plenty of pearl clutchers on MN but (unless there's a backstory) I really don't see how one sex Christmas gift is such an issue.
If this were a gift from my DH to me then it would be because he'd have seen the item and thought it would look good on me and want to see me in it before/during sex.
Let's not pretend that we expect men to know there are luxury underwear brands and LH is cheap shite. That's just classic MN deliberate obtuse/snobbery.
On my side of the fence (As a wife who received underwear yesterday which I have no doubt was bought for me to wear so my husband can look/take photos/have sex with me wearing) I was grateful for the sexy underwear.
This is coming from a relationship where if at any point one of us is uncomfortable or doesn't want sex it's fine.
But to me the underwear was my husband saying "I love you. You're super hot. You're the only person in the world I'd get this for. Here's a promise of some great times ahead."
So yes while he will get enjoyment from me wearing the underwear it's also going to lead to me having a great time.
It's like saying if DH buys us a day out then it's a cop out if he goes too.
Without knowing any sort of relationship backstory then labelling a partner negatively for buying underwear is really a stretch too far.