BDSM and TTC

My husband and I are in a (slowly progressing) DD/lg relationship. We have just decided to start TTC, and I'm a little apprehensive about how these two aspects of our relationship will affect each other. Does anyone have any experience with this, or have children while in this type of relationship? A "successful" evening of play usually involves a lot of time-consuming foreplay, and I'm nervous that it will disappear, after we have kids. :/