Why men always have outside sex within there wife's pregnancy (Page 6)

we all are human
been in matrimonial home,
living with your wife happily  peace and one love, but why men always have outside sex within the periodical time of there wife pregnancy, for example after 5,or 6 to7 month's which the doctor can prescript, then after deliverance which the man will still have another two to three month's before sex, when you calculate all this month atlist 6months breake's,

they will still love there wife deaply but they can't endure the stand, some wife who have understanding of humaniterial meassure, will accept it. if they find out but unwise called it cheat,

please can some body give us some fact and reason for a man not to have outsidesex within his wife pregnancy