I often think back to my personal experiences. And one in particular. It involves a girl with whom I was her first sexual partner when she was 18. I can still remember the delightful smell of her wet pussy. I used to visit her at her mums house and when she was out we would get intimate. I think it smelt so good as she was a virgin, healthy and was physically fit through horse riding. I would drive home with the fresh smell on my hands, not want to wash the aroma away.
When I start thinking of that and her innocence it makes me ejaculate almost instantly.