Is not “CIS” a transgender delusion?
The term Consistently Identified (with their) Sex (CIS) certainly has its origin in the LGBT activist community and, as you probably know, simply means heterosexual. I think it may actually predate slightly the current surge by transsexual activists but it certainly was crafted to take the existence of transsexuals into account.
I chose to use it (as opposed to heterosexual male/female) as I was trying to imitate/satirize the fine grained parsing of sex and gender terminology that the LGBTqrsxyz)community is perpetually obsessed with.