Prince Harry has said he might try relationships with men if he “changes his mind” about women, while on a night out with his current girlfriend.

Harry and his girlfriend, Cressida Bonas, were taking a night out together at The Rum Kitchen in Notting Hill on Friday, when Harry was slipped the phone number of Vincenzo Ianniello.

He reportedly accepted the number happily, and promised to call Mr Ianniello if he changed his mind about dating women.

Mr Ianniello later tweeted about the exchange: “I gave Prince Harry my number tonight, he promised he’ll call me if he changes his mind about women. Or men. #epicwin”

Last week Conservative peer Lord True suggested the law needs to be changed to prepare for a married lesbian Queen who conceives using donor sperm.

Friends close to James Middleton, the Duchess of Cambridge’s younger brother, dismissed rumours that he is gay but also say he’s not “bothered” by them.

In November 2012 Prince Harry and his brother, Prince William, wrote a letter supporting the Terrence Higgins Trust in its campaign against HIV.

Earlier in 2012 Harry came under fire for using the word “queer”, but was defended by Peter Tatchell, who pointed out that Harry has made a video diary in which he kisses and licks the face of another male soldier.