I feel like It is very necessary to feel comfortable with your partner enough to trust them not to exceed your limits and read your body language, and also check in with you! (i.e using safe words) It is also difficult maybe if you are a trauma surviver! It is also very necessary to know you don't owe your partner sex which I am sure most people should know but some people still don't agree? and that is hella scary! I would definitely avoid people like that.