This review from a 90 minute US version. The British Film Classification Board website states it approved a 92 minute version in 1975, so a longer version may still exist.
An unnamed woman is topless at Grady's camp.
Sheryl strips down to her underwear before going for a swim. Phil joins her and they make out, but no nudity.
Sheryl and Phil make out again, fully clothed.
Vera (Rachel English?) is topless in bed next to Big Red in a whorehouse. Phil enters the "lobby" of the whorehouse where several fully dressed women sit, waiting their next customer.
Sheryl and Phil make out near the end of the movie, no nudity.