She may be one of music’s biggest fashion risk-takers, but when it comes to sex, Solange Knowles is all about playing it safe. The singer has joined forces with MTV and beauty brand The Body Shop to spread the word about HIV/AIDS prevention, kicking off her new gig by turning out in N.Y.C. yesterday to promote the launch of yestosafesex.com. The interactive MTV-designed website encourages visitors to pledge their dedication to safer sex practices — and lets them enter to win gift bags stuffed with goodies from The Body Shop and MTV. Want another way to support the cause? The Body Shop is making it easy to put your money where your mouth is, with their new Yes, Yes, Yes! lip butter. Approximately $5 of the $8 purchase price will be donated to the Staying Alive Foundation to help raise world-wide awareness about preventing HIV and AIDS.