Go hide in a sauna!

You scurry across the gym, bottomless, carrying her cloths and yours, and duck down the hall to the saunas. From the commotion behind you, you're fairly certain she's not free yet, so you might have just enough time to ditch her clothes before leading her on a wild goose chase. Or maybe you could just disappear into a sauna and lock the door behind you.

A quick skim of the four position locks shows no vacancies, and the only unlocked sauna is set to men. Considering your recent fun in the gym proper, and your judgment somewhat colored by the fun the hottie had between your legs, you make that split-second decision and dive unhesitatingly into the one marked "men."

The door presses closed behind, and you can see clear enough through the steam to tell the three towel-clad men in here are immediately aware of your utter lack of bottoms.

It won't be long before she comes after you, you've got to keep acting quickly.