While you might be more familiar with externally rotated legs as hip openers (like pigeon pose category of poses), if you're going for juiced up hips, you'll also benefit from doing the exact opposite, internal rotation of the legs - 'say whaaaat'? In this thorough practice you'll learn new ways to move your legs in relationship to your hips. You might experience interesting sensation in your groins while doing the internal rotation, that is not injurious, you're just accessing a certain set of muscles that tend to be left out.