Describes one who is open to participating in free, positive, erotic expression with multiple partners of either sex; a festive environment where open sexuality is enjoyed and encouraged; orgiastic behaviour. Usually refers to the openly sexual enjoyments of a hip, bohemian or patrician class of people.
The Bay Area and L.A. have a large Modern community who enjoy frolicking wildly at Modern parties. "There's a hot Modern party happening on Saturday night." "I'd love to play with you, but I'm not feeling very Modern right now."