Why women is not punishable at extra-marital affairs?

Is gender neutral can't apply for these types of cases,whatever a man can think and as well as women can think like that. Adultery.— Whoever has sexual intercourse with a person who is and whom he knows or has reason to believe to be the wife of another man, without the consent or connivance of that man, such sexual intercourse not amounting to the offence of rape, is guilty of the offence of adultery, and shall be punished with imprisonment of either description for a term which may extend to five years, or with fine, or with both. In such case the wife shall [not][4] be punishable as an abettor. And why that the woman can't believe that man was an husband of an other woman. I think that women also punishable . It is favour to women and no gender equality