 Coutts testified that he wrapped a pair of nylon tights around Jane's neck as part of a consensual sexual practice known as erotic asphyxia, which he had undertaken on numerous previous occasions with several different lovers.The prosecution claimed that he had invited her to his flat under false pretences, then attacked her.Evidence was given by a defence witness that several years ago, Jane had whispered to a colleague that a sexual encounter the previous night had "involved some kind of stopping breathing".