Truth in fiction - men be aware that catting around has possibly resulted in your children being killed and you are often never told. One of many good reasons to wait until married.
And yes your wife could do it too but in three years at a crisis pregnancy center I saw one married woman abort and her husband wanted her to. The married ones just don’t tend to do it, certainly not behind your back, very uncommon in my experience.
Unfortunately, for some wives that guy in the bed is not so much their partner as a supporting cast member.