Cargo of Love (1968)

A young woman answering an ad for a traveling companion winds up drugged, kidnapped and in the clutches of a sex slavery ring.

 Ellie (Sheila Britt) has just arrived in Europe in response to a classified ad in the paper, requesting a traveling companion.

"Girl 18-21, Traveling companion to wido; Hi pay and excellent living facilities. Travel London - Paris-Rome etc. for well-groomed, intelligent girl of very hi calibre. Many extras."

 Ellie meets Lupa (Gloria Irizarry) at the airport, and she brings her home.

 Ellie gets changed for bed.

 Lupa enters the room, and it becomes apparent to Ellie that things aren't going as planned.

 The have some drinks before bed.

 Of course, Ellie's drink is drugged and she's knocked out.

 When she awakens, she's in a bare room on a mattress. 

 She's molested by a couple of assholes.

 Thankfully, Lupa's faithful servant Pepe (Sam Stewart) comes to her aid.

 Ellie meets her fellow sex slaves.  She learns that there's no hope of escape.

 Lupa has her girls line up.  One of them has escaped and she's taking roll.

 Denise (Jean Parker) runs through the woods in a black nightie.

 But she's eventually caught, stripped and raped.

 Lupa has one of the girls (Angelique) oil her up.

 Lupa enjoys her massage.

F.B.I. Chief (William Countryman) has pinpointed the source of missing girls to the classified ads in the newspaper.  He's assisted by a female agent (Barbara Wallace).

 The agent is to pose as a sex slave.  Once inside the operation, she'll use a special copper-coated lipstick which will allow the FBI to track her location.

 Back at the sex slave ring headquarters - a girl (Janet Banzet) has died.  They carry her dead nude body to the woods in the dead of night to be burned.

 Thankfully they brought "E-Z Pour" gasoline.

 It's pretty dark, but you can make out a totally nude Janet Banzet fairly well.

 The only full frontal nudity in the film comes when Janet Banzet is rolled down a ditch.

 the FBI agent has managed to infiltrate the sex slave ring.  Now it's time to use the lipstick.

 She and Ellie make a run for it in the dark (too damn dark to tell what's going on, actually).

 Ellie escapes, but the FBI chief finds his female agent dead.

 She's carried somewhere.

 The sex slave ring erupts into chaos.  You can't tell what exactly is happening, and then it abruptly ends.

If you came for a story, you'll be disappointed.  If you came for the titties, you'll be disappointed.  In fact, I can't envision any scenario where you would not come away from this disappointed. 

★★★☆☆☆☆☆☆☆