It is not advisable to begin a relationship with another person, whether it is sexual or not during the separation and/or divorce process. It is advisable to tell the potential boyfriend or girlfriend to remain out of the picture until the divorce case is settled or litigated to conclusion. While that may seem draconian, it is certainly advisable in circumstances where custody and access issues have not been resolved. However, the most important precaution if you are dating is to never do anything sexually inappropriate in front of the children, never speak ill of the other parent to the paramour in front of the children or allow the paramour to do so.