My girlfriend \[21 F\] and I \[25 M\] like to have threesomes. We are not in an open relationship, but are fine with involving other people in sex as long as we are doing it together, and we have done it both with guys and girls.
Now, my girlfriend seems is pretty disgusted by my semen. She lets me finish on her only when we do it doggy and I cum on her back, but even that makes her a bit uncomfortable. I once inevitably came on her stomach because I couldn’t hold it anymore and she was really grossed out. She takes the pill for precaution, but I never came inside her, let alone her mouth or any other part of her body.
I am fine with it, even though it makes things a bit less spicy for me, but I have never complained or forced anything on her, as we both respect each other’s quirks.
Now, it happened last week that we were having a threesome with a new guy. While she was giving me a blowjob, the other guy was penetrating her from behind; when the guy asked if he had to pull out, my girlfriend said “don’t pull out, finish inside”, and he creampied her.
I couldn’t find the courage to talk to her about it, but I was really upset. Not only didn’t she find it disgusting to have another man’s semen inside her pussy, she even told him to do so. What should I do? Is this a red flag? Should I worry we are actually sexually incompatible?