I also love how you have completely ignored the latter half of the quote, 'Did they mean the same or something totally different in the 1980's?'.
Well, I was fourteen when LTK came out (geddit? "Came out"?), so let me try to help.
Let's take the lines of dialogue you've chosen:
- "I don't like it.... HE CAN FINGER ME!?"
Now, okay, this
could be construed as innunedo, I suppose, but do you
really think the filmmakers intended this to be a
double-entendre? These things only work if they're funny, but what would be so hilarious about Krest implying that he's worried about the possibility of a guy performing sexual acts on him with his fingers?
Compare and contrast with Moneypenny in TWINE telling Bond that she knows "exactly where to put" the cigar. It works as a
double entendre (although, personally, I find it crude and not especially amusing) because it's followed by a pause for the audience's filthy minds to get to work, and then there's a payoff when Moneypenny lobs the cigar into the bin.
- "I wanna deep six him!"
You say that this sounds "quite disgusting", but I'm not aware of any sexual connotation here. Then again, I'm not exactly a youngster any more, so I'm probably not up on the current "yoof" slang. How is "deep six" a disgusting expression?
- "I've seen a lot of girls like you COME!........ and go!"
I've seen LTK an embarrassing number of time. I've probably watched it more than John Glen has. But on none of my many, many viewings did I get the impression that Krest was referring to seeing lots of women like Lupe having orgasms.
I'm not trying to be rude to you, but I genuinely do not see any of the examples you've given as deliberate innuendo, let alone "disgusting".