What exactly did your friend tell you? (Note: I do know that the Marine Corps has been reaching out to the gay community recently, which turns my stomach and makes my blood boil!
Some of th same things I saw. Communal showers where young Marines (up to 3-4) cram into one stall and commence bathing each other. Squad shower parties at some of the FOB’s, a known instance of a female SeaBee servicing a truckload of fellow SeaBee’s caught on surveillance video. Stuff like that.