to ForeverTight :Yeah, Titthibasana is tough but seen many girls do it. You are so slim so may be in future you can do. For now try variations of Uttasanas, may be in heels for a quickie outdoors?
to partyman911 :Outdoor in heels is a good idea! Titthibasana B is also nice, but you need to be very flexible and balancing will be more difficult while fucking ^^