Bob Anthony promo:

(321) BIG JOHN POPS OFF (or SEXUAL PARADISE).

This is a 3-in-a-bed as BIG JOHN (well named) and LITTLE JOHN (almost as big as Big John and a hairy-chested little bastard with a really beautiful ass) entertain a butch Marine with tattoos. They try a little wine, but soon switch to the hard stuff—their own cocks and cum. They sniff poppers and demonstrate acrobatic versatility in some inspired suck-and-fuck variation. A hot & horny 3-some.

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The Cinéography and this promo for Big John Pops Off both claim that it is the same film as Sexual Paradise whose promo says otherwise. The 321 film ID on all three titles may be the source for the confusion.