The wave is an intercourse position in which the girl sits on the guy's lap.
You must sit very close together and wrap your arms around your lover, otherwise the penis slips out of the vagina.
It’s not possible to thrust in this position. You have to find a rocking movement using your whole body.
It’s a relaxing position that you can stay in for a long time (as long as the guy doesn’t lose his erection).
If the woman tenses her PC muscles, stimulation will increase: the tighter the fit of the vagina around the penis, the more sensual the feeling for both of you.