Laura You spread your legs too much
Not even close. Fun fact: Opening your legs has almost no effect on the internal vaginal structure or the pelvic floor, other than letting people / things / instruments get closer. Straddling a bike or even doing the horizontal splits won't break a hymen. You might rip your adductor muscles off your leg though! If you rip them off at the pelvic attatchment you would have MUCH bigger things to worry about than a little bit of skin. So don't stress, you could be hung, drawn and quartered and it would probably rip your legs off before it tore your girly bits!