Hole in One by Peter Willow

From the back:

Private club for private urges

When Bob Mathewson became caddy at an exclusive country club, golf resort, he never bargained for 'extra-duty' requirements he had to fulfill. Nympho Eleanor Hayes plays a few games of golf with young Bob, that are enough to make both of them champs. Muriel Rinehart, a switch-hitter lesbian, married to a gay boy, urges Bob to enter twilight love with the two of them. Sally Benson, with more money than she knows what to spend it on - until she found she could buy bizarre pleasures, with no holds barred.

'I'm butch,' explains Hilda, as she is about to initiate Eleanor into a way of life that she promises will be the solution to her problems of frustration. 'Let me do everything... the next time around, maybe you can become butch.'

A bold novel about the secret desires of couples and singles, who join country clubs to get exercise best described as 'bedtime movements.'