Can it not be like sirens singing about your deepest desires to lure you in the water. So asexuals get sung to about snuggling in a blanket with a hot cuppa of Coco.

Maybe the charm of the succubus could be the same for sexual tensions. What they find most desirable to find in others.

The warforged could see the best artificer who is able to understand all the intricacies of your function.

A monk sees a teacher who is able to gently guide their way to mastery.

Etc