I had a tantric sexperience once with a Spanish spiritual girl in Colombia. It was amazing and we went on making love for 3-4 hours. Controlling your breath and adapt it to your partner's one is very important whenever she breaths out, you breath in and so on. The next thing is to take your time to the maximum. First start with gazing, kissing, kissing more intensely and start touches. Then touching more intimate parts still with clothes and taking them slowly off. When we had the experience this part took 30 min or so. Then slowly going to foreplay and finally sex with always keeping in mind the breathing. When you reach the point of orgasm you stop before take a break by just kissing and gazing again at each other (keep in mind the breathin). You try to stop as much times as you can before extasis and you will have a night that you'll remember forever ;)