Bismihi ta'ala

We can look at this issue from multiple angles. Firstly, we know as Muslims that it is haram for us to look at the private parts of other people. We also know that anything that is sexually arousing, outside a marital relationship is also haram. 

As far as the shar'i side is concerned, we confidently know the many detrimental dangers there are if we defy the commands of God.  We know these harmful sins will affect our soul and our mind, and pollute us spiritually and morally.

On a relationship side, it would be very problematic if a husband, or a wife, would need external sexual arousal from fake unrealistic sources to make their time together enjoyable. It's not a good sign at all.

This shows a deep issue in how the husband sees the wife, or how the wife sees the husband. 

True enjoyment can be fulfilled just by the husband and wife, and they are so sexually captivated by each other, they need abolutely nothing else, or nobody else. 

It is only when one is unsatisfied with what they have, they turn to other means. It is for this reason, that along with what our religion and our moral standards teach us, it would also be very damaging for the husband - wife relationship itself. 

With prayers for your success.