Grifter... No Children?

In the beginning of the WildCATs run, grifter is portrayed has a lady's man.  Thru the years they have shown him flirting with most of the women he has come across.  He is known to have had relations with Zealot, and presumed to have had others.  But at the end of the day... No children.  It is funny that of all the Team 7 Members he is the one with no children.  All the rest have children (at least 1) but Cole dogged the bullet. 
It makes me ask...Why?  Is he careful?  Lucky?  Or just a part of his past overlooked by the writers.  It would be a blast for the new series to throw this out as yet another curve ball for him to handle in his new series.
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