The most likely would be #240 "Sweet Alice," which was just John Holmes and Seka.
However, it could have also been one of the following, each of which had additional cast members in the scene but may just not have been in this portion.
#258 "Ball Game" also with Jamie Gillis
#294 "Super Hot Rod 2" also with Mike Horner and Kandi Barbour
#295 "Ski Bunnies 2" also with Desiree Cousteau
#296 "Love With an Improper Stranger" also with Joan Thomas
#1125 "John Holmes' Cocktail" also with Lisa de Leeuw
As for the second image, I'm going to guess that is Seka with Ken Yontz (it is hard to tell with that little of his face), who she was married to for a period of time.
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