A lipstick lesbian is a woman who pretends to enjoy sex with other women, in order to a please men. Aka, a fake lesbian. The reason for this is that she is 'putting on' her lesbianism, as you put on a lipstick.
She knows he loves to see her eating pussy; she's a lipstick lesbian.
A very common disease. It's about that part of kpop fans who pretend to be lesbians. Many of them are aged 13-16 and may also use neopronouns. Many of them also do this just because it's considered cool in kpoptwt