They reunited after 10 years last week, and the stars of hit sitcom Friends confirmed what many wondered since the last episode aired in 2004 – was there any off-screen romance? When reunion host Andy Cohen asked the cast – minus Matthew Perry, in London for a play – if they’d signed contracts saying they wouldn’t sleep with each other, things got awkward. “David, say something,” Lisa Kudrow told David Schwimmer. “Well, that was broken,” he said. While fans speculate Lisa, 52, and David, 49, were the ones to hook up, Woman’s Day revealed last year they weren’t the only ones. An insider said Jennifer Aniston, 47, and Matt LeBlanc, 48, had a secret relationship. Earlier this year, a source close to Matthew, 46, and Courteney Cox, 51, said, “There…