Someone asked me to elaborate on the important issue of AWKWARD SEX SCENES IN FANTASY GAMEBOOKS. This was the other example I know, though my only actual reading of it was a drunken LOLfeast with other nerds when I was 18 so my memory of the details is probably shaky.
Anyway this is by GARY FUCKING GYGAX who invented D&D so was Old-Man Object Of Fun #1 for hep young British geeks. During the gamebook boom he was asked or quite reasonably decided to cash in and write a few. They were about a barbarian going on a quest to prove his manhood.
They included a scene where the lone barbarian at his manly campfire is approached by a woman (COMELINESS 18) and the choice you get is will you send her packing or let her spend the night by your fire - if you take the latter you HAVE THE SEX with your nubile visitor BUT!
In the morning when you wake up you feel a strange WEAKNESS and lose some of your power points (or whatever) (or maybe you get robbed) - BZZT wrong kind of PROVING MANHOOD Sagard! Sex is NOT what manly barbarians get up to when they are on a quest and by believing the wiles of a WOMAN you have made the wrong decision, foolish adventurer.
If you say no the book congratulates you for seeing through her so-called CHARMS and sends you on your mighty-thewed way.