Jack said:
I don't want to describe this because of particular reasons but you can read the literature on Berlin sex clubs and you'll quickly come to understand why I hate these yehuborim so much and their culture.
Actually, I can remember seeing something briefly about different places and their sexual interests, and Germany seemed to be rather...kinky. Quite...very-not-vanilla. (This is coming from someone who has seen a lot of non-vanilla stuff and am quite used to it now, but it was quite a long time ago I saw that programme.) So based on that, I can imagine.
Jack said:
And I would be willing to engage in bisexual sex with my girlfriend if and only if the third party is a girl. I'd allow her dating other girls too but I draw the line at being a cuck which I can't do.
I presumed Jack was a Boy's name. A Boy fucking his girlfriend and another Girl is not Jack being bisexual!

"Come on, honey. You said we could have a bisexual threesome; I bought some lube for you! ;-)"