They say love makes the world go around, so Happy Valentine’s Day. And let’s check out “Sports Illustrated’s” annual swimsuit issue. Californian Marisa Miller is on the cover, making her seventh appearance in the issue that will be read by 69 million, and generate 250 million page views online. Auto racer Danica Patrick and NFL cheerleaders are making their debuts. Miller, who is a big sports fan — she told ESPN that the team colors she would wear in body paint would be those of the San Francisco 49ers — appeared on David Letterman on Monday night as a three-story billboard of the cover was unveiled. Swimsuit models rang the closing bell at the New York Stock Exchange on Thursday. It may be time to invest: when an American model appears on the cover of the swimsuit issue, the stock market does nearly twice as well as when a foreign model does.