In a relationship the two most dangerous things are: the
disappearance and the flattening of sex. Based on the above example, the
husband’s perverted sexual fantasies probably won’t ruin the relationship, but
there will be a great chance that sex becomes flat, leading to its total
disappearance after a while. Cold or flat or average sex life does not ruin
most relationships, however, there can be side effects. For example, a husband
is more likely to jerk off watching bandage or dominatrix porn than to touch
his wife. Then sex is slowly disappearing from the relationship, and when
watching porn has become boring, the husband will start fancying other women on
the street or in shops, eventually leading to the first paid sex-affairs with
prostitutes and escorts, who will satisfy his kinky desires. Besides, due the lack
of sex and sex-affairs, the marriage will be at risk.