It is wrong to drug someone's drink.
Peter told Carl he had not yet had sex with his new girlfriend, Tammy, so Carl gave Peter a powder to put in her drink to make her “willing”.
Peter wants Tammy to say yes to sex.
Peter throws away the powder and talks to Tammy about sex, she says yes after they talk through a few things.
Peter makes Tammy a drink with powder in it , she becomes  affectionate and tell's Peter she wants him.
Peter and Tammy are able to have a satisfying sex life.
Tammy has a bad and lasting reaction to the drugand Peter blames himself.