Marriage is not a guarantee of non-homosexuality (attraction to women can be faked) ... but it is a better safeguard than is celibacy (wherein attraction to women need not even be faked).
SnakeDoc
Incidentally, most Protestant missionaries in the 19th cent. were required to be married. Churches did not want to send single young men among "natives" (many scantily clad), knowing that disgrace to their cause would likely result.