This has a rather short and direct answer.

The first pornographic film we have record of is A Les Cul d'Or (At the Golden Bottom). It involves a man coming home from an unspecified battle, a mustachioed musketeer. He comes to an inn and demands some food and hospitality. The innkeeper, sadly, has no food. He instead tells the woman in the inn, likely his "daughter" to go give the man a very different kind of food. Cunnilingus. She gives him cunnilingus. And then they have intercourse. And then another woman comes over and there is a "impulsive" threesome.

That would seem to fit the first roleplay and profession roleplayed as.