I was asking myself these very questions when my ex pressured me into all sorts and tried to pressure me into threesomes, being fucked in front of him by someone else, being a prize in some gay wrestling competition, being tied up, spat on, urinated on, degraded etc. etc. etc.
Some of it I succumbed to over a five year period but most I could not bring myself to but this caused a feeling of fear and inadequacy that saw me be beaten down mentally into a permanently depressed husk believing I was wholly inadequate, and allowing him to use that feeling to make me feel inadequate in every part of my life.
Each time I let him do something, he would use that to immediately, and I mean straight after sex, pressure me into the next thing.
I felt like there was something wrong with me. It may sound small but it bled into every area of my life and almost made me think about leaving this world.
Instead I left him, and now I will never put up with sexual pressure for even a moment. I realise that just wanting safe sex that makes me feel loved is absolutely fine and even if it were abnormal that's me.
I realise that being "boring" is fine and I don't have to perform for anyone.
Even if the man hints at wanting to think about pressuring me that will be it.
I would consider mentioning the threesome more than once pressure.