When you take a girl/guy out for a date and don't let her/him go to the bathroom. Upon arriving back home you proceed to have anal with her/him until she/he poops on you dick. You then blow your load and the poop all over her/his back. This is the rusty part. The venture is where you remove the poop and cum without using your hands.
Man last night I took your woman out for dinner and gave her a Rusty Venture when we got home. Let me tell you the poop didn't taste nearly as good as the steak at dinner. Totally not gay though.
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