“We are often negative about ourselves (thinking things like, ‘I’m not sexy enough’, ‘I’m too hairy’, ‘I’m too fat’, ‘I’m this’, ‘I’m that’), so you need to flood your brain with positive messages about your body, sex appeal, sexual performance, and self.”
Article source: https://www.huffingtonpost.co.uk/entry/spectatoring-during-sex-signs_uk_6ad61237e4b05d72fd927a22