Is sex necessary?

The ads on google mail quite often throw up some interesting links (like the one this post is about) and sometimes some quite random ones (for example, there's a guy who was advertising www.gihan.org, but he hadn't really gone beyond a "this site is under construction" kind of thing, and now go-daddy has taken the site offline)

Anyway, to quote Forbes' article,

"The best that modern science can say for sexual abstinence is that it's harmless when practiced in moderation. Having regular and enthusiastic sex, by contrast, confers a host of measurable physiological advantages, be you male or female. (This assumes that you are engaging in sex without contracting a sexually transmitted disease.)"

It goes on to list quite a few positive outcomes of regular sex, including improved sense of smell, reduced risk of heart disease, weight loss/overall fitness, reduced depression, pain relief, less frequent colds and flues, better bladder control, happier teeth, and a happier prostrate.