The answer is C feet, they definitely sweat the most. (and stink the most)
I say the skies the limit! I am 28 yrs. Young and just did an hour of ashtanga yoga, no splits by any means! (ouch) but it requires a lot of flexibility, and practice. Yoga is 1% theory and 99% practice. Practice makes perfect and with the split too, practice makes perfect!
No they are not sexually transmitted