United Kingdom, April 15 -- Nick Carter has been accused of sexually assaulting a woman and passing on STDs that led to cervical cancer.

The Backstreet Boys singer has denied allegations made in a lawsuit filed by Laura Penly, who claimed the 45-year-old star sexually assaulted her when she was around 19 years old in 2004.

In documents obtained by People magazine, Laura alleged she and Nick had a "sexually intimate relationship" between December 2004 and February 2005, when they would see each other approximately every few weeks" when she visited Los Angeles.

The woman claimed sex was consensual at least three times before things took a turn at Nick's Hollywood apartment.

Laura insisted she had never had unprotected sex with anyone be...