Regaining your erection might not happen all the time after you have been consistently losing them, perhaps some kind of medications like Sildenafil Citrate can help.  In many people a long foreplay tends to cause an early erection and ideally foreplay is meant to stimulate and bring out erection.

If you do not want erection naturally you might have to skip on the foreplay session in a bit; however, it is not a one sided process and you need to satisfy your partner and the girl is never done for better without foreplay and it can be killing when you are not able to do it. Practice and a lot of patience are required to deal with the problem without any kind of medication at all.

In many cases there are partners who tend to fake the kind of orgasm they achieve just to keep their males feel better.  This can be hurting to the man not caring for the female at all when they tend to experience the same stuff over and over again. Well ideally you got to discuss with your partner about going up first or last. When you and your partner are agreeable with each other then you might not feel the shortcomings are too bad. You will learn to cope with each other. This is possible only when it is your considerate spouse not when you are changing between several women just for the fun of it. They need just fun and they are not going to help you out.