Have sex in a public place! But make absolutely sure that no one will see you. It's part of the thrill, the threat of discovery, but if someone sees you, it can be a bad thing.  However that rush of lust that makes you both need it -- right here, right now -- and the risk of discovery are the stuff that sexual fantasies are made of. So make it as hot and fun as you can -- public sex is a thrilling encounter that can never be exactly duplicated. Having a quickie in a secluded part of the parking lot can be a sexually explosive experience.  Some types of sex are better suited for public places. Oral sex is probally the best for public encounters because one can try to be on the lookout while the other has a happy mouthful, it can be performed relatively quickly, and a minimum of clothing is shed. Vaginal intercourse is next on the list of easily done deeds, because skirts can be lifted and pants opened to fit genitals together somewhat discreetly, and it's possible to appear as though you are standing very closely when in fact you are engaging in penetration.  Mutual masturbation is a discreet and pleasingly dirty way to have public sex, with no removal of clothing necessary and simultaneous pleasure for both of you.

Seek out a moderately secluded spot such as one of the following: The back of a car (parked in a out-of-the-way spot), a quiet remote alley, a public bathrooms (lock the door), In your backyard, a public park at night, a parking garage, a peep show booth, a rooftop, on a boat, a hotel balcony late at night, a drive-in theater, or your workplace after hours. If the mile high club is more your speed, don’t try it on a commercial airliner, they frown upon that now a days. Try here.