Just a short note:
Lin just said something, that sounded really logical for me when I read your last comment. I could easily understood where he was coming from.
He would feel more threatened by a woman having sex with me, than a man. Why? He regards woman on woman as some kind of playing at home. Woman know what woman want. Better than men ever could. So, reduced on the physical part of the problem, woman are more threatening to him
Sward is on the same page, btw.
Facts: 30, female, bi, v-type relationship with Sward (husband, straight, mono) and Lin (boyfriend, straight, mono), poly-fi and co-primary.