No, it's neither.
It's that he's awkward and not very experienced in those situations, and it leaves him feeling uncomfortable and exposed, which is something he doesn't like to be.
He tries very hard to be a strong, confident, independent person, and anything that makes him look less than that bothers him.
So, his 'great fear' is to be put into a situation where, not only can he not put up any type of resistance, but anything he does will make him look weak in the eyes of the other crew members. Couple that with his insane amount of discomfort with women due to his lack of experience in the matter, and you get the situation we saw in the jefferies tube with Seven.