Not in every African culture. You dont' get sexually excited from every single woman you dance with. Waht if you dance with your sister or grandmother, they roll hips. Not sexual at all.
In a lot of cultures women and men don't even dance with each other, they dance with their gender.
But when the women dance the men watch and when the men dance the women watch.
Dancing symbolizes youth, health, fertility and virility, in most cultures, but that doesn't mean their is a direct link between it and sex.
You could argue their isn't a direct link between twerking and sex, but we still know why men enjoy twerking.