Dating a bi girl
The most likely bisexual archetype to lead to But Not Too Bi.Compare and contrast Everyone Is Bi, where either this trope is in effect for the majority of the cast or sexuality is simply presented as a non-issue. You go to bed one night, wake up the next morning and poof, you're a lesbian? Compare Casual Kink, which is the same thing for BDSM and fetishism.Compare Ambiguously Bi, where things are more, well, ambiguous.
A guy has to be careful of who he is dealing with — many will tell you that they are a college girl when they obviously are not.
As a sugar daddy, you are in the honeymoon stage most of the time — you get treated well, you get lots of romantic evenings and you are seen as a savior of the women in distress and the facilitator of her better lifestyle.
I have gone on vacations with some women and given some women extra money, but that's after I get to know them well.
Contrast Depraved Bisexual, where bisexuality is used as a way to make the character seem more evil (or conversely, being bisexual makes you evil), and Anything That Moves, where bisexuality is treated as a lack of discrimination in partners (in real life the two are not necessarily linked; just as straight and gay people don't find of their preferred sex attractive, bisexual people don't find "everyone" attractive).
Contrast Suddenly Sexuality, where a character skips from gay to straight or vice versa with no warning, and No Bisexuals, where the characters/narrative don't consider bisexuality as an option.