Last night my boyfriend started quizzing me about previous sexual partners, not about whether they were good etc but when it was and if they were a boyfriend or ONS.
It made me extremely uncomfortable and he wasn't pleased with what he heard as I lost my virginity at an extremely young age.
Personally I do not see the issue because I'd prefer to have had sex young with a boyfriend when I felt ready to, than for example wait til my 20s and maybe jump into bed with anyone because I felt desperate to get it over with! But if I'd done the latter I can't imagine it would have been an issue 
He said that I'm not the person he thought I was (nice!) which is pretty much him saying I'm a slag.
I can't see the relationship lasting much longer but that's another story.
Anyway back to the thread!
Do you think it's ok for a partner to ask anything about your sexual history?
Is it always a red flag if they ask or is it sometimes ok?
Would you ever ask them yourself or be happy to answer them?
If you cheated in a previous relationship should you tell your new partner or is it irrelevant?
Personally I don't really want to know about a boyfriends sexual encounters, I don't see why you'd want to know!