Well, I think I'm a voice in the choir, but....

Something like this isn't something that should be a matter of "giving in." You have no reasonable expectation nor any form of obligation to do anything sexually that you are not comfortable with, and he likewise has no authority to deliver an ultimatum between two choices you don't like. You have every right, now and always, to *not* do something that makes you uncomfortable. You should *never* have to "give in" on something sexually that makes you uncomfortable. That, with all due respect, is wrong of him to ask of you.

I hope things work out soon and for the best.

Hugs,
Harley