Whatmeworry, I do realise there have been overarching "fashions" in body hair throughout history and in different countries and cultures, whether it be hair on the face, head, legs or genitals. However, women removing all or most of their pubic hair through waxing or shaving in Western society is a modern phenomenon.
As mentioned, 20 years ago, I was a nurse - a year of that working in gynaecology so in an average day, I saw between 20 and 40 pudendae. Apart from women who had no or little pubic hair due to chemotherapy or medical conditions, and a few who probably "trimmed" the length and around the top edge a bit, I honestly don't recall ever seeing a hairless or nearly hairless pubic region on any patients. This was in a hospital in London and I saw women of all ages, from all cultures and backgrounds of all socio-economic classes.
I left nursing, but kept in touch with a former colleague who stayed in the field. I distinctly remember a conversation with her in 2003 when she said that she first started noticing a few women shaving or waxing in the late 1990's, but it was still unusual to see more than a couple a week, mostly young women, until after the turn of the millennium when more and more were showing up.
This timeframe corresponds to the emergence of hairless genitals in porn, at a time when porn was becoming more explicit and readily accessible, free of charge, via the internet.
With regard to pre-op shaving, this was a common tradition that had no clinical basis. Research has shown that pre-op shaving can increase the risk of post op infection of the surgical site. (See Norrie & Melen, 2011's comprehensive review of evidence ), If hair will get in the way of stitching the wound (wherever it is on the body,) it is recommended that it be clipped short rather than shaved. When I've had surgery, the pre-op information from NHS in Wales said explicitly NOT to remove hair before surgery, citing research. It depresses me if health care practitioners are either retreating to outmoded traditions or putting fashion above clinical evidence.
As for fashion, a doctor raised serious concerns about the increased risk of skin and gynae infections as well as scarring associated with pubic hair removal. But I doubt this will make a difference when the practice has become so embedded and the marketing of products and services based on the falsehoods that pubic hair is ugly, dirty, smelly and unsexy means women feel they have to "suffer to be beautiful." I can only hope that sometime soon, there will be some sort of backlash against it and a move to "go natural" again.