From an issue of Video Watchdog magazine (US):
The film, which troubled the new regime at the Hays Board, ran afoul of the censorship Code and was cut by 12m prior to its general release, but do not fear - a preview cut was discovered in the MGM vaults in 1987 and is presented here in all its graphic glory. Among the restored bits: an early splatter effect, as a cursed Gaboni is stabbed in the neck and blood gushes forth (if you stll-step through this, you can see the blade retract); the aforementioned nude silhouette as Jane changes clothes; and, most importantly, Jane's nude swim with Tarzan, her body (O'Sullivan's double) fully and clearly visible by the underwater camera for a surprisingly long stretch.
IMDB also has a few comments along these lines about the cuts.