I read it without consideration about the author. Overall I thought it was good general information and took note of the sincerity of the tone to urge readers to snuggle "post-coital esp. with virgin". Was expecting more diving into kinky human sexuality but perhaps seems more like the author is trying to educate the basics to us his brethren.

And what exactly is so bad about his advice?

He also wrote The Cathedral and the Bazaar if I'm not mistaken. If that can balance it all out.