"do you want to play with me?"
An invitation to engage in a game of some sort (tennis, golf, cards, etc.) or perhaps a musical performance. Have not heard it used in a sexual sense.
"do you want to have sex with me?"
One meaning and one meaning only.
"do you want to get off with me?"
Get off (the bus, subway, etc.). More likely, a reference to "getting high" (as in drug use), which could lead to something sexual. Have not heard it otherwise used in a sexual sense (that would be more like "Get your rocks off").
"do you want to tap off with me?"
Totally new. Never before encountered.
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