There was an adult nerd who didn't have much luck with the ladies, until a woman who advised men on sex gave him a special powder aphrodisiac that would make any woman fall into lust with him after ingesting the substance.

I remember him slipping this powder into the drink of at least two women:

A hot co-worker who initially hated him, but ended up banging him in the office basement store room after drinking some coffee with the powder in it. I recall there being a chain-link fence and wooden boxes in this scene.

Next he banged his boss's wife, who he was (I believe) initially tasked with baby-sitting while his boss was at a basketball game or something. He made her some tea with this powder in it.

In the end, the woman who had given him the powder revealed it was a placebo, and the women he had banged were attracted to his confidence (or something; this wasn't really the major detail I took away from my viewing experience.)

I don't recall if this was a movie, or rather the episode of a late-night softcore show. Regardless, an answer would be greatly appreciated!