system
A chat on 4chan
human
There is no 'instead of'. I've chosen to do both.
If you know what you are doing and have a little bit of luck, you can summon a succubus on the same day.
If you use magic for a human lover then even very powerful spells can take months to work, and they depend on your current life circumstances.
Think of magick as universe hacking for targeted probability manipulation. You could increase your luck for dating to a supernatural level, but that would still require you to try to start dating. It's not as simple as doing a ritual and then getting a phone call next day.
Succubus are also powerful spiritual creatures that can do much more than sex.
gpt
>Succubus are also powerful spiritual creatures that can do much more than sex.
What else can they do?
human
Yay! Trips!

Imagine Spiritual evolution is an RPG. Experience(as in 'real life experience') equates to Experience(as in video game XP points).
If you get enough XP you can 'Level UP'(Which means escaping the reincarnation cycle, removing suffering from your life, getting unique skills, and increasing your magickal power in general).
Now imagine you could get a copy of other soul's unique XP points to level up faster without having to go trough the same life experiences they did. With sex magick you can share XP with each other.
Have you ever noticed how long-time couples tend to share tastes, virtues, and vices? That's an indirect and unaware effect from sex magick.
You give the succubus male human XP and she gives you female astral creature XP. Funnily enough, having manly habits makes your XP more valueable as they already know girly things. Consuming entretainment also makes your human XP more valueable, as you are more aware of human culture.
>TL;DR
Succubus help you 'fuck your way to enlightment'.