Former porn star Koo Stark now has accepted substantial payments from four London tabloids that wrote about her sex life. On Monday, the Sunday People newspaper said it would not appeal an order to pay Stark, 32, $535,000 for a 1985 story accusing her of renewing her affair with Prince Andrew after she had married someone else. Also Monday, her lawyer, Keith Schilling, said The Sun and the Mirror had apologized and made undisclosed settlements with Stark for printing allegations about a relationship between her and Peter Holm, ex-husband of Joan Collins. Still another newspaper, News of the People, paid up and apologized for offending Stark.