We're planning a trip for this summer. While we're not LS, alcohol will sometimes make my wife a bit adventurous. Will we get into trouble if I rub or kiss her boobs in the pool? What if she invites another gentleman to do the same?
So generally, as long as bottoms remain on and covering the genitals, anything goes when between partners. Obviously if expanding beyond you and your partner, then ensuring the other party's consent to joining is key.
I remember (kind of) a few years ago where alcohol infused whipped cream was always around the sexy pool. Great times indeed.