Sienna admits she lost her virginity at the age of sixteen and says that her mum encouraged her to bring her boyfriends home.
She says "I had my first sexual experience in my own bedroom" and "I had my first serious boyfriend when I was 16 and my mother made sure that I brought him home. It was a very open household but I only brought home guys I really liked".
It might surprise you to know that girls in England (where I grew up) commonly have their first sex, meaning penetration, at age 13-14 and this is not new and has been happening for at least 50 years to the best of my knowledge.
And my parents also allowed me to have girls sleep over from the time I wanted to do so. They said that if I was ready that I'd do it and that they preferred to know who I was doing it with.