Here is another thought, take it or leave it. It relates directly to one's priorities: a possibly desperate need for marital intercourse as distinct from the desire and committment to living a life with God in prayer. One must be very cautious of one's priorities.
So this is my thought:
"(S)he who has not learned to live with 'God Alone' in a life of prayer/supernatural charity, ought not to undertake to live with another human being in Holy Matrimony."
(My thought is inspired from a text that is cherished dearly by contemplative religious, coming from the Imitation of Christ: "He alone should spend time in the company of men, who would rather be in solitude with God.")
Granted, my thought does place the bar rather high, and I admit that it may be a bit overstated. But there is unquestionably a grain of truth to it: Holy Matrimony is a Sacrament. It is a God-given, grace-giving covenant made by man with woman in the presence of God. If I have no habits of prayer upon entering such a covenant, it may be pretty difficult to establish them at all.
And once God becomes second, not first, in Holy Matrimony, then will my prospective bride become second........second to ME. Sad, but true. My thought is fundamentally accurate--although demanding. Remember the great statement Fr. Patrick Peyton, champion of the Family Rosary in the earlier 20th century: "The family that prays together, stays together."
The couple that loves each other in God, and who stand hand in hand in God's presence by prayer, have alot of grace going for them.