Automatic romance between opposite sex (or two gay) characters

[MrDibble]

I think you’re thinking of of this thread, although the premise was thermonuclear war survivors not shipwrecked people:

Horrifically bad title replaced

Continuing the discussion from Do sexual preferences make one a bigot?: Here’s a sick hypothetical. In the aftermath of global thermonuclear war, everybody is dead except you and one other person who is of the opposite sex. You are both fertile. The other person absolutely refuses to consent to sex. Let’s say they are ideologically opposed to continuing the human species, but not a suicide threat, and get along pretty well with you. Do you rape him/her? ~Max