Trouble Is My Business [front]
by Jay Flynn. Cover art looks like it's by Robert McGinnis. He always painted ladies with that style of sandal.
I'm rereading this one at the moment, having read it almost exactly a year ago. (I'm digging through my pulp books to find out which ones I want to keep the most). It's about as lurid as the cover suggests, with lots of sex (mostly threesomes and not kinky by today's standards); and the date of printing seems it could be wrong. It claims to have been published in 1967, except that there are a couple of things in it which suggest it was written later than that, not least the guy who had "been a hippie in the fading days of Ashbury". Er, wasn't 1967 still the height of Height-Ashbury hippies, not the fading days, which didn't come until after 1969? The same character also worked in Cuba "years ago" in the mid-60s, except that, er, 1967 is still in the mid-60s, or not that many years from it, and in any case Americans haven't been welcome in Cuba since the Bay of Pigs in 1961.
However, the cover design is far more consistent with 1960s design than with 1970s design, when photo-covers were far more popular.