Just looking at the prevalence of subject headings in WorldCat
transsexual | 172 |
transsexualism | 2722 |
transsexuality | 31 |
transsexuals | 1908 |
- |
transexual | 11 |
transexualism | 12 |
transexuality | 3 |
transexuals | 27 |
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