Here's a Finnish cover for a sleaze paperback by Donald Westlake, writing as "Alan Marshall", which was one of the pseudonyms he alone used. If I remember correctly. The sleaze pseudonyms are a tricky thing.
The book in question was called originally Virgin's Summer (Midwood 1960), which is also the Finnish title. I haven't read this one, but a friend of mine - who knows his Westlake - has and he said that it's clearly Westlake. The cover copy says: "He [or she?] felt his/her first love experience as a waking dream. [Huh?] And then it wasn't a dream anymore... Roaring tale about what goes on behind the closed doors of American motels!"
The Finnish edition was published by Finnbooks in their Domino series in 1967.