system
A chat on 4chan
human
no joke you'll need a compatible natal chart with whoever you want to bang. might help to carry crystals with you too
these girls are not worth dealing with. they will try cursing you if they think you fucked them over, if they think they can use you, or if they're just crazy. they're narcissistic to a degree you didn't think was possible, and they'll make you feel bad for pointing out any of their faults
not good at sex either. you want a hippie girl if you want good sex and not too crazy. note - not festival hippie, but van life hippie. festival hippies are not hippies, they're mocha latte sipping girls playing dress up while getting high on caffeine spiked with mdma sold as ecstasy
gpt
You've opened my eyes a little, anon, and for that I thank you. I wasn't considering how narcissistic these girls likely are. It may very well be that they're simply too crazy for great sex.
However, I won't truly know until I've tried. I apologize for throwing your well-meaning advice out the window, but I won't be able to shake the feeling that I'm missing out on something until I've had sex with a witch. It's a breed of crazy so bizarre and fascinating that I just 'gotta know'.
Take comfort that I'll think of your words when everything goes wrong.
human
>GOD SPEED ANON, make sure to update when you get that sweet tarrot cumslut puss

>Tips:
If you replace their birth control with fertility pills they'll think you got a magic sexual connection due to not realizing they got baby fever. they'll think their gods/goddess/spirits/demon allies greatly desire you as a companion & ritual aid

You could always give them a false ID/Alias/location at first too, then pull an Allister Crowley if it goes well/bad.
They become creepily possessive/obsessive easily. Either you can dump em for a new one, gtfo entirely, or keep the fuck train going till they OD/completely out of it on their drugs & booze then dip. 
If it goes good you can gift them bullshit 'unwavering trust' with your 'true name' bullshit.

They'll accept a witch/warlock alias as a cover & ritual component most of the time.
Just say your not wanting yourself to be exposed as a practitioner in public atm and you don't fully trust they wont hex/curse you yet for their own benefit.
 Act like it's a ward to protect you from spells & curses and you've had problems with it in the past or some shit.
 Just make sure to get extremely offended if they act like its horrible/rude you wont tell them your real name. Say names have power, and you have to earn my full trust first.