Just looking at the prevalence of subject headings in WorldCat
| transsexual | |
| transsexualism | |
| transsexuality | |
| transsexuals | |
| - |
| transexual | |
| transexualism | |
| transexuality | |
| transexuals | |
As far as I'm concerned, single 'S' is a typo.
Maybe we should spell sex "sexx" and give it a different meaning too.
Renate