You shouldn't have sex with a prostitute.
Walter is a single man who misses having the company of a female.
Walter wants to have sex with a woman.
Walter goes on a dating app and discloses exactly what he's looking for with the women he speaks with.
Walter finds a prostitute and spends the night with her.
Walter lands a date from the app who has the same desires that he does.
Walter gets infected with an STD.