"So how do I hit on you?"
Short/my answer: you don't.
Long answer: If you think someone is attractive, then okay. But not everyone you're attracted to is going to be attracted to you, especially asexuals. If they want a romantic relationship, that's fine too, just respect the fact that they're asexual.
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Asexual Problems
RandomThese are problems and things that asexuals, aromantics, and other people on the asexual spectrum encounter. . . . Note: Most of these are not mine. Highest/best tag ranking: #47 non-fiction.