This book is a fast-paced read, and is very readable. It is aimed very much at a "bloke" market, so being female, I do understand I am not the target audience at all, which is probably why I found it rather depressing, even though parts of it were very amusing.
Also, it was first published in the late 1970s, so a lot of society's attitudes have changed since then - killing people whilst drinking and driving, and positively encouraging drunk driving and finding it funny aren't the norm any more, and are not generally socially acceptable, whereas it was when the book was written (and a chunk of the book hinges on this). Also, if a man of 32 got a rather dim 20 year old student pregnant, he wouldn't be expected instantly go about divorcing his wife to marry her, especially when he wasn't too keen on being a parent anyway. Oh yes, and women gave up their jobs the moment they got married (yes, yes, I know it was normal for the time for their social group, I must keep telling myself that!).
Without giving too much of the plot away, this novel concerns a 32 year old man who is having a mid-life crisis. He's been diagnosed as infertile, but this doesn't really seem to be connected to his random casual sex with strangers. After lots of partner-swapping, and lots of alcohol, it has a rather unhappy ending for everyone concerned. (It's a bit like one of the exercises we used to be set in English lessons in school - write a story of no more than 1500 words picking up the story 5 years later. It wouldn't be a jolly follow-up.)
It does have some funny lines, and I'm just giving it 3 stars because I am inevitably seeing it from a 21st century point of view - I wasn't born when this book was published, and the attitudes seem like a whole different world to me. It's kind of uncomfortable to read for a woman, there's a lot of misogyny. Women are either sex objects or apes or mothers. They don't have their own distinct personalities.