The sole purpose of getting married is not to act on our fleshly desires; but the purpose of marriage is to glorify God through our marriage. (Not ourselves)
I don't believe EVERYONE is called to marriage. Paul even says that is BETTER to remain single so that you are free to dedicate ALL of yourself to God.
I believe homosexual attractions are the type of thing Paul was describing with the "thorn in the flesh" in 2 Corinthians 12:7-10. I'm not saying that Paul did in fact have homosexual attration (although it is possible); but that this "thorn in the flesh" was something Paul had to deal with constantly...a type of temptation or inclination of the flesh. (His "fleshy desires")
7 Therefore, that I might not become too elated, a thorn in the flesh was given to me, an angel of Satan, to beat me, to keep me from being too elated. 8 Three times I begged the Lord about this, that it might leave me, 9 but he said to me, "My grace is sufficient for you, for power is made perfect in weakness." I will rather boast most gladly of my weaknesses, in order that the power of Christ may dwell with me. 10 Therefore, I am content with weaknesses, insults, hardships, persecutions, and constraints, for the sake of Christ; for when I am weak, then I am strong.