I agree w/ Harley. I don't think it is lack of experience on your part. Men are not real complicted creatures. It should not take that long reguardless of what you are doing to him. I agree w/ Harley maybe check w/ a doctor about this. Are there psychological reason due to a past relationship w/ him. 20 min is about as long as it should take assuming you are trying to prolong things. Just talk it over the best you can. Also good for you for making up your mind not to have sex and sticking to those morals.