Loyalty

To lead you must serve those under you. Commander Shepard knew this and even with his own high libido, he was nothing if not a giver. Whether it was solving family matters, or putting his face or hand between the legs of his subordinates, Shepard knew that there was more than one way to gain and maintain his squad's loyalty

If there's one thing I love, it's trope subversion. You've heard of a woman on her knees surrounded by men, now get a load of a guy on his knees surrounded by women!