By Chiara Fiorillo Jane Seymour has revealed that she is having the most passionate sex of her life with her boyfriend John Zambetti. The 72-year-old actress, who has been married and divorced four times, got candid about the couple’s sex life after going public with their relationship in October. In an essay for Cosmopolitan that was published this week, Jane said that after the age of 60 “you come to realise” that intimacy “can also be self-serving”. And while describing her intimate life with her 73-year-old boyfriend, she said it is “wonderful and passionate” because it is “built on trust,…