Hitch Hikers by Peter Willow

From the back:

On a lonely road at midnight...

A gloved thumb points in the direction you're driving. 'Can you give me a lift?' If you do... what will happen? Some of the bizarre adventures that befall drivers and hitch hikers are told in astonishing detail.

Donald and Carol - identical twins, who played a 'brother-and-sister' act (but were they really related?) for any drivers who picked them up. Linda - a soft-faced lesbian who would become a woman's companion and satisfy her as no man would ever do. Mike - a dull-witted muscle boy. Pick up this hitch hiker in black leather boots and be surprised at the tricks he knows.

Let's meet the drivers. Pat and Julie - switch hitting lesbians who pick up 'thumbers' for a weekend, using them for the most debauched perversions. You'll read about Pat's special 'rubber gadget that makes me as good as a man.' She'll use it on you if you don't watch out. Edith Nelson - wealthy, lonely, bored, looking for pickups to satisfy her 'abnormal' compulsions. Susan - a lesbian 'oncer' who picks up female hitch hikers only. Then there's Nedda and her husband, Rod and their way out party friends. They look for victims to 'put on a show' at parties. What better show is there than a twin brother and sister? Or... are they really twin hitch hikers or just coincidental look-alikes? Everyone wondered - so did they, so will you!

A novel as bold as a leather boot, as slicing as a cat o' nine tails, written by a master craftsman in the arts of the bizarre.

'Can you give us a lift?'