Creepiness is a complex subject, and there are many shades of it. In general, it seems to be anything that makes women sexually uncomfortable is perceived as c

Creepiness is a complex subject, and there are many shades of it. In general, it seems to be anything that makes women sexually uncomfortable is perceived as creepy (from Models by Mark Manson). But the ones that can (and should) be avoided is: - Expressing sexual intentions in some sneaky way (like, staring at a girl but hesitating with talking to her). Though, importantly, playful flirting is not considered creepy (even though it's not about showing things explicitly). - Pursuing her for too long when she is not interested (some behaviors can be super romantic or creepy, totally depending on her interest in you, which you may not know). Yet, from what I seen (and learned) being upfront (or flirting playifully) AND leaving ample space for her to turn you down (so - not being to pushy or needy) is good enough (and actionable). To some point it is not possible to be creepy-proof if you want to show any sexual intentions. At the same time, it's not a big deal (and shouldn't be).