It's implied a couple had sex in an alley when they show her putting her panties back on under her skirt. No nudity shown.

A couple swim underwater nude and kiss in a pool. Her breasts are visible.

A couple in their underwear fall on a bed together. Then he jumps up, gets dressed, kisses her and runs off.

A couple have sex in bed with her on top. Her back and one breast is visible.

A clothed couple kiss passionately outside. He pulls down her shirt revealing her breasts as he fondles one. He then licks two fingers and slips his hand under her skirt to finger her a moment (not visible). Then they have sex.