Personally, I feel that we need a little public advertising like the pictures of Krista with her ski, and the brand 69 Slam. Done correctly, like these posted above can be both sexy and flattering and can draw people of both genders into the sport one way or another. After all, while Krista Rogers is one VERY good looking girl, these photo's are nothing more then one would see at a tournament where a woman skier is getting ready for a set or whatever.
I do, however, feel that sleazy/porn like ads (3/4 naked models crawling all over a car/boat with facial expressions like a porn star) do NOT have a place because we are trying to draw both men and women into the sport and not look like we are horny school kids or dirty old men. Sex sells, but only to one gender at a time. A fine line IMO and I believe the pictures that @Horton posted are on the good side of that line. I would have no problem showing these pictures and or TV ads to my other half or my mother to show a sport, ski, brand, whatever.