Sex evangelist Pure on dating apps, sex education in Russia, BDSM and relationships On December 3, the spontaneous dating service Pure announced that it had hired 23-year-old HSE graduate, organizer of the educational project “ Sex Education ” and BDSM practitioner Elena Rydkina for the unusual position of sex evangelist. TJ talked with the girl about her new job, sex education in Russia and abroad, polyamorous relationships, as well as technological trends and dating applications.