Things are going from bad to worse for Britney Spears - she's now caught up in a new sex tape scandal. A day after losing physical custody of her kids to ex-husband Kevin Federline, an unnamed 28-year-old man has come forward with sex tales. The mystery guy claims to have bedded Spears while she was vacationing on Hawaii in June (07) - and he caught the sexploits on camera. And Spears' one-night-stand lover insists the only thing that has been stopping him from going public with the sex tape is the fact he wasn't happy with his own performance which he caught on camera. He tells America's In Touch Weekly magazine, "It was just normal sex, we didn't do anything crazy. It was a little disappointing. It lasted for about 25 minutes and then we passed out." The 28-year-old reveals he was living on Hawaii's Big Island when he met Spears at a bar on 7 June (07). They retired to her room at the Four Seasons hotel on the KonaKohala Coast and made love. The mystery lover admits Spears had no knowledge he was filming their sex session.