You're using the word clergy too broadly making your assertion false with respect to mainline Protestant denominations, for example, in which the vast majority of clergy are married. In fact, it's not unusual for more than 95% of the senior pastors in a mainline Protestant denomination to be married.
You're really talking about the Catholic Church. And there your assertion is true. However, not primarily for the reason that you stated. You see, it is well documented that homosexuals began entering Catholic seminaries in large numbers decades ago precipitating the child abuse scandals that later followed.
The Catholic Church did not and still does not vet their priests properly with respect to homosexuality and when they are discovered, the Catholic Church doesn't even enforce their own policy.
Even after a priest committed homosexual acts or sex crimes against minors, they were often relocated by the Catholic Church to begin anew in many instances.
The John Jay Report of 2004 documented that homosexual men entered the Catholic priesthood in noticeable numbers in the 1970's and 80's which resulted in the sweeping sexual abuse and sexual immorality scandals around the globe [1].
So it's no surprise that studies by Wolf and Sipe from the early 1990s suggest that the percentage of priests in the Catholic Church who admitted to being homosexual or were in homosexual relationships was well above the national average for the United States of America.[2]
Elizabeth Stuart, a former convener of the Catholic Caucus of the Lesbian and Gay Christian movement claimed, "It has been estimated that at least 33 percent of all priests in the RC Church in the United States are homosexual."[3]
One report suggested that since the mid-1980s Roman Catholic priests in the United States were dying from AIDS-related illnesses at a rate four times higher than that of the general population; with most of the cases contracted through same-sex relations, and the cause often concealed on their death certificates.[4]
And both past and present studies have shown a much higher rate of pediphilia amongst homosexuals per capita than hetrosexuals [5].
They even made their way to the highest levels of the Catholic Church pressuring the pope himself which resulted in the scandal leading to the last pope's retirement [6].
The Roman Catholic church has a homosexual priest problem currently and the present pope is opening the door to more of it rather than reforming the existing problem. The result will be a second wave in due time.
The common variable, of course, is homosexuality.
1. John Jay Report, 2004,
http://www.usccb.org/issues-and-act...nd-Deacons-in-the-United-States-1950-2002.pdf
2. J. Wolf, Gay Priests, New York, 1989; R. Sipe, A Secret World: sexuality and the search for celibacy, New York, 1990
3. Stuart, Elizabeth. Roman Catholics and Homosexuality, quoted by Kate Saunders in Catholics and Sex.
4. "Report: Priests hit hard by hidden AIDS epidemic". Actupny.org. 2000-01-31. Retrieved 2013-02-11.
5.
http://www.regent.edu/acad/schlaw/s...cs/issues/v14n2/Vol. 14, No. 2, 3 Baldwin.pdf
6.
Papal resignation linked to inquiry into 'Vatican gay officials', says paper | World news | The Guardian