What have I added? You said that your potential partners must follow the "rule" of always being available for sex. I'm saying that that's unrealistic, that sometimes people are not in the mood and therefore not available. By calling that controlling, I am adding nothing but a judgement of the rule you present.
Furthermore, requiring them to be always available for sex is not only controlling but treats them like property. Romantic partners are not cattle to be bred on demand.
“As I am sure any cat owner will be able to tell you,
someone else putting you in a box is entirely different
from getting into a box yourself.” —bisexualbaker