I so can't do relationships on Dr Who. I grew up with that show, through all the other doctors ... I just can't add sex into that equation.

And I have a vague memory that Romana may have briefly flirted with a non-humanoid body in the 'regeneration' scene where they switched from Mary Tamm to Lalla Ward... I say 'regeneration' because she *chose* to change her body, and switched through a few different options before settling on the end product (and didn't *have* to change due to imminent death).