People do not necessarily “become very sexual due to past traumatic event.” In the case of females it can be studied in the clinical literature that victims of incest in particular often take one of several paths: avoidance of men, consecrated virginity, or promiscuity/ prostitution. It doesn’t mean that any of those three populations are comprised mostly of sexually abused females, but it is indeed a statistical fact that girls abused especially by their fathers often (not always) take one of these paths. I haven’t read the literature on whether males also choose or drift into those options. (And I am speaking about a male.)
However, your comment about “becoming very sexual” is bordering on a stereotype about homosexuals. (That they are “more sexed” than heterosexuals.) The aspect of sexual frequency is more complex, relating to individual variations, as well as different norms of behavior in an all-male environment (vs. a mixed environment), as well as (often) the substitution of the more complete relationship possible in a complementary (male/female) one, for simply “more of the same.” The latter is also reported in the clinical literature. However, I haven’t read that lesbians --whatever the origination of their own attraction-- necessarily have more frequent sex than heterosexual women.
In any case, my relative is not, nor was, “a very sexual person.” (vs. normal)
First of all, I don’t like the word “cure,” nor the phrase “turning straight.” If you adhere (as I do) to the teachings of the Church, and if one understands those teachings well, it is more a case of returning to an original (ordered) sexuality after departing to a disordered lifestyle in an attempt to “cure” the wounds lacking in the model of healthy heterosexuality, a model which is normally shown in a loving, accepting father-figure who respects the integrity of his son, doesn’t try to change his son’s innate personality, is open to his son, is present to his son at the crucial very early years, and therefore does not generate in the son an impulse to seek that father figure in a different (inappropriate) intimacy.
Also, this might be splitting hairs, but I don’t just mean “not nagging.” The thing about truly open love is that it is transparent, mirroring the love of God, which inevitably urges people Home to Him. I’m not saying our family are saints or anything

, but merely that complete surrender to the hidden goodness of another is possible for all of us, and when it occurs (with God’s grace), it allows those we connect with to convert more easily, due to the irresistibility of God’s own love. I say this even more from my own experience (as being on the receiving end of others with “pure” love for me, whose love encouraged me to goodness and away from evil, or opposition to God’s law).
Hope that helps.