Silly Valka, sex appeal is what the companions are for.
Not for women who prefer guys. I've been trying to remember the last sexy male Companion the Doctor had... (no, it's not Captain Jack; he doesn't do a thing for me).
Think, ponder, muse...
Let's review the male Companions, okay?
We'll dispense with the new Doctor Who stuff - none of the guys fit my personal criteria, and while I might find whats-'is-name (Amy's husband) cute, he's married. Off-limits, according to my personal code of honor.
Doctor #Eight had one male Companion (Chang Lee). He was too young.
Doctor #Seven had no male Companions, just a lamentable set of irritating female Companions (Mel and Ace).
Doctor #Six had no male Companions, an equally lamentable set of irritating female Companions (Peri and Mel).
Doctor #Five had three male Companions: Adric (too young), Kamelion (robot), and Turlough (weird eyebrows). Female Companions: Nyssa, Tegan, Peri.
Doctor #Four had three male Companions: Harry Sullivan (cute, age-appropriate, but not within my personal definition of "sexy"), K-9 Mk I and II (robot dog), Adric (too young). Female Companions: Sarah Jane Smith, Leela, Romana I, Romana II, Nyssa, Tegan.
Doctor #Three had no male Companions. Female Companions: Liz Shaw, Jo Grant, Sarah Jane Smith.
Doctor #Two had two male Companions: Ben (nonentity, really) and Jamie (cute; the female fans at the time - in the late '60s - considered him incredibly sexy). Female Companions: Polly, Victoria, Zoe. Zoe was petite and rather cute.
Doctor #One had three male Companions: Ian Chesterton, Steven, and Ben. Female Companions: Susan, Barbara, Vicki, Katarina, Sara Kingdom, Dodo, Polly.
Honorary Companions: the guys of U.N.I.T.: Sergeant Benton, Captain Mike Yates, Brigadier Lethbridge-Stewart. Mike Yates was kinda cute, I suppose.
But my choice for sexiest male Companion? No contest: Ian Chesterton. Runner-up: Jamie McCrimmon (I've said it before on CFC: I enjoy looking at men in kilts!).