The secret of pleasure with enemas is NOT to force anything. The idea that you enema as preparation for anal sex is NOT forced. You do this so that the anal experience can be enjoyed.
I am assuming that you are newly married and that anal sex is one of the things that you and your husband are experimenting with. I can tell you that Walter and I experimented with anal sex when we were newly married.
We, also, experimented with vaginal sex while giving and recieving an enema. However, once the experimenting stage was completed; we moved away from anal sex; but kept enemas as a fore play to our sexual habits.
Then, as we both started to work longer hours and were away from home more often, enemas were often substituted for sexual activity. So we each self administered enemas in conjunction with masterbation when making love was not possible.
I suggest that you experiment with self administration to see how long you can retain and how the holding back makes you feel. The longer retention is a turn on; then you may wish to add this experience to your husband's fore play. You did not mention whether or not you husband gives you enemas or idf you give him enemas. If not, then doing so may be an experience that you might both enjoy. As with all things, it is best to discuss these activities with your husband. Sometime the discussions can be every bit as arousing as the actual thing.