yes sex counts! this is what I did for miost of my cardio for my last 2 shows this spring, you have to change the sweat soaked sheets every night but it is well worth it!
I have done 0 cardio leading up to my shows so far, it make my legs flatten out and I lose a lot of muscle too. I will incorperate it for my shows this summer though,
I have been doing a lot of research on this lately also, this is what conclusion and theory is....
after a leg workout I do the seated bike for about 20 min very low intensity,for a few reason 1sr it helps with my recovery time drastically!, second there is very low impact on the legs as they dont need any more impact or trauma after a good leg workout!
I think switching up cardio every 2 weeks is best for a continous no plateau effect, the body will get used to cardio faster than it takes to adapt to a weight training stimulis.
jogging is a lot of impact on the lower body so imo it is not needed
treadmill walking at an incline, eliptical,bike, stepmill, swtiched up every 2 weeks will give the best result. which ever one of theese i have listed you hate the most will probably be the best for you! (stepmill)
swimming is also good although i have found studys stating that the cold water will make the body want to hold onto fat to insulate it, I have not swam in the past but will incorperate it into my regime this year.
Cardio is very effective at building mitochondria and is good to recruite slow twitch muscle fiber hence the reason I am incorperating it even though for fat loss I dont need it.