Not true.
Such churches do exist.
Followers of Santo Daime – one of the Christian religions, based in Brazil – use ayahuasca (which contains DMT, an extremely powerful psychedelic) as a central part of their mass. Hell, the central part of their mass. The religion has won court cases in both Europe and the States, upholding both its status as a “real religion”, and, crucially, its right to use ayahuasca for mass.
That kind of thing is certainly not without precedent.
During the second half of the 19th century, drugs of different kinds – hasch, mescaline, opium, etc. – were used for specifically religious purposes on both sides of the Atlantic, including by self-professed Christians.
A staunch Scottish Protestant doctor named George Wyld, for example, used chloroform for religious purposes, believing that the effect it had on him – essentially, it gave him “out-of-body experiences” – not only proved the existence of the soul, but also allowed for it to travel independently of the body, and freely explore unseen worlds.
A Spiritualist newspaper (and mind you practically all Spiritualists back then self-identified as Christians) wrote enthusiastically about Dr. Wyld’s experiments that:
OK then, but what about sex?
Well, first off, practically all churches “feature” sex in the sense that they allow it. There is a certain place for it (marriage), within which it is considered absolutely cool. Very few Christian churches outright forbid sex.
As for making sex part of the actual religious rituals… Well yes, it’s uncommon, but certainly not unheard of. The followers of abbé Boullan used sex to purify themselves; the followers of Georges Le Clément de Saint-Marcq put an odd twist on the idea of holy communion, believing that the correct way to perform it involved, uh, not bread and wine but, eh – hope all kids have left the room by now – a certain other bodily fluid. Sperm, is what I’m saying. They believed in eating sperm. And considered themselves 100% Christian, too!
So, yeah: People mix sexuality and Christianity all the time, and always have. Same as with drugs.
Fringe phenomena, you say? Sure, yes – you won’t exactly see the Pope smoking crystal meth during New Year’s Mass anytime soon (but can you imagine…!?).
But it’s also not like mixing religion and sex and/or drugs is “inconceivable” in a Christian context, or that that kind of thing belongs to some long-gone hunter-gatherer past.