Adult emails are spam – and you can't stop spam. Anybody who has your home or office address can send you letters and anybody who has.
Porn spam doesn't mean anyone did anything illicit. from some group or site called Adult Dating, plus alot of male-oriented adult spam, and I'm not even a guy !.
One of the earliest types of spam came bearing adult and pornographic content. To the current day, it remains one of the most common forms a user will find in.