For many JWs, having any sex is just a "phase". Typically, they're too busy with meetings, preaching, 'studying', and other cult busy-work, along with often working long hours at low wages, to have much time and energy left for sex.
There were plenty of JW couples I knew that I assumed they might still have somewhat active sex lives. But particularly after I became an elder, I learned about a lot of couples that were very unhappy about all kinds of sexual things... including accusations such as "He committed adultery in his heart. Maybe I can't divorce him, but I'm gonna act like we are." and "Maybe she has health problems and I do nothing to help her or be a romantic gentleman, but she should put out when I say so."
So should anybody be surprised that WT would tell homosexuals that this is a "phase" that they shouldn't act on? Heterosexuals are instructed by WT that their sexual desire is something they should "deaden" and deny, too.