The attraction is usually influenced by complicated emotional and psychological factors that extend much deeper than mere impressions or mere preferences. Otherwise, in some situations, some men get attracted to married women without necessarily knowing the reason since other reasons such as emotional comfort, seen stability or insecurities in their personality quietly affect their feelings and decisions as they mature.
Emotional Stability

A sense of emotional equilibrium that is projected by married women through life experience and ritualized approaches makes many men subconsciously attracted. This perceived consistency can be calming enough especially to individuals who might be grappling with uncertainty in their personal or professional lives.
Perceived Maturity

The married women are considered as mature because of the life responsibilities and life experience they have and this may lead to admiration. Such maturity can also make the conversation meaningful and interactions more grounded, which can be of interest to people who want more richness in them.
Low Expectations

Other men are less pressured by such relationships since they expect less in the long term or demands. Such a conviction may lead to an illusion of comfort, and the case might seem not as complicated as it is.
Emotional Validation

Attention or appreciation of one by a person who is already engaged elsewhere can be a confirmation to some other people. It can build confidence and make one feel loved in a special or exclusive way.
Sense Of Challenge

Human nature prefers to work on what is hard to get sometimes and this is where an inner sense of difficulty is formed. To certain guys, this is an issue more of egoism than emotional attachment.
Escapism Factor

Being involved in such circumstances may also be some form of escaping problems or incongruence in the personal life. It enables people to forget about their own troubles and issues in the short run.
Idealized Image

The marriage women might seem more composed or emotionally stable as viewed with the outside eye, which enhances idealization. Such perception is not full and may be very strong in attraction giving an unrealistic image.
Personal Insecurity

The lack of insecurities may in certain situations compel the people to find circumstances where they are less susceptible to rejection. The dynamic might be less threatening emotionally, although it might not be stable and rewarding in the long-term.