Former Playboy playmate and veteran erotic straight-to-video actress Shannon Tweed was chosen by President Clinton Monday to head the newly created U.S. Task Force on Nudity & Aging. Calling Tweed the 'grand old dame of the softcore, R-rated, made-for-cable film industry,' Clinton said the oft-topless actress was 'ideal for the position, bringing with her more than 20 years of nudity-related experience.' The task force will examine the effects of aging on nudity-based careers and help develop new strategies for approaching both toplessness and full-frontal nudity for actresses over 40. Tweed will assume her new role later this month, following the completion of her latest film, Bare Evidence, which co-stars William Katt as a cop who goes undercover to find a killer who's stalking the strip joints of a major metropolitan city. The film will be available in both R-rated and unrated formats in video stores this fall. 