In addition to what has already been said, one thing to consider is that when a man or woman is put in a situation where they feel their sexual performance is being tested, it sometimes does not go well, because they feel self-conscious and under pressure to perform, and consequently are too stressed or awkward to engage with the situation.

This is rather different from a situation where two people commit to a marriage, commit to working through any sexual difficulties on either side (including any long-term medical, psychological, or psychiatric interventions), and focus on enjoying their relationship with each other in a holistic manner with an attitude of love and support, which is a less threatening sort of situation, and one that is more likely to nurture a long-term good relationship.

Wishing you both the best!