With this kind of movie, one cannot be too critical, as long as there are lots of attractive nude women who enjoy each other, that's the point of these movies. So you kinda need attractive nude women.
Babes in Kongland is some odd mixture of 3 different movies. One involves male scientists who are doing some research. They are supposed to provide comic relief. (they aren't). The other involves one dirty-looking blond and a chubby ugly brunette playing with each other a lot. Here we get to see plenty of the blond's body, but thankfully not much of the brunette's. The final and longest sequence involves five topless girls on an island who have the hots for a guy in a monkey suit. Of the five, 2 are attractive and only one these has a decent body. The rest are ugly and don't have to body for this movie. Odly enough they never go past being topless, although some of them are quite affectionate to each other for a few seconds. Of these 3 segments neither one is watchable let alone enjoyable. You'll find yourself putting this thing on mute and fast-forwarding most of it.
This being the first DVD release of Secret Key one has to be worried about what the rest will be like, although some of the trailers look very promising- I take it they will have a different production team. I can't think of one reason to recommend this mess, unless you are attracted to women of fuller figures but who lack chest size.