Possibly a lesbian?

I've been wondering about several women in the entertainment industry of the last few years, & I can't wondering if whether they are gay. There's Saira Todd, who has had several lesbian roles, including, Playing The Field, & a patient in Holby City, an ex-girlfriend of lesbian doctor, Tash. Kate Buffery, who has had, two lesbian roles, The Rainbow(starring opposite Imogen Stubbs), & Close Relations. Liza Tarbuck, who is single but never talks about having a boyfriend, & seems very touchy-feely with other women on the various TV show's, such as gameshows, she has presented. Janet McTeer, played lesbian, Vita Sackville-West in a TV adaptation of A Portrait of a Marriage. She also has a certain sapphic look don't you think? Jemima Rooper, played a lesbian in three dramas, Hex, Sugar Rush & Lost in Austen, (Or was she just pretending in Lost In Austen). Tamsin Greig, looks quite boyish, & I've never heard about her being in a heterosexual relationship or marriage. And lastly for now the British former tennis player, Sam Smith, again looks boyish, & there are & have been more lesbian tennis players! I'd love some answers, pretty please!