From Wikipedia:
Walliams hinted at being pansexual in the book Inside Little Britain, but said he did not like to be labelled by that word. In an interview with Radio Times in 2013, he stated: "I think it's all about falling in love with the person and that is overlooked, really. I hate it when people 'confess' or 'reveal' their sexuality and also things can change for people over the years. So it is about the person but I also think it goes beyond that. You don't just fall in love with someone's body, do you? You fall in love with someone's soul and heart and brain."