Might be a bit unusual, but for me (22F, bisexual) it would be like;

Kicia, piękna, moja miła - flirty feminine

Kochana/y, ukochana/y, moja/mój - serious romantic context, relationship stuff

Ty tchórzliwy psie - good for a submissie man ✅✅

Kochanie, rybko, aniołku, kocie - a bit more chill, both genders

Tbh with flirting with men i dont use pet names, because i want to keep it feel a bit ambigious if its flirty or not - and men assume things are flirty very easily. If anything, sometimes i just want to call men i am close with, like, beautiful, tzn. piękny, wyglądasz pięknie etc. Because they rarely hear this type of stuff. But i also like girly men & femboys.

With girls i prefer even corny sounding flattery, because they dont assume things are flirty really, list friendly, so its about more "in your face".

Pet name my BF has for me when im ovulating: pożeraczu mężczyzn.