Synopsis courtesy Private
Beautiful Barbara has to sneak onto the Private yacht as a stowaway because it is fully booked, but she is soon discovered by one of the ship's officers. She is allowed to stay on because she is so attractive. After paying for her transport with blowjobs, fucking and DP's they decide to let her be a real Private girl, a dream she has always wanted to fullfil since she first lost her virginity.
The listing above is based on the end-credits. In the (hindsight-favoured) DVD-menu, Lucka is credited as Susanna; this probably means Elvis was originally credited as Orsolya. The menu also credits Jessica as Micha, and - confusingly - Orsolya Blonde as plain Orsolya.
The names Andy Priscilla, Monika and Viktoria appear at the end of the credits and presumably refer to the two nude dancers (AP, 6527) and one other.