souls, doggie's an easy position for both of ya if she's leaning over something (back of the couch, side of the bed) or with a bunch of pillows underneath for stability...few things suck like getting shoved across the bed 'til he can't reach you to slide inside you anymore!
lying on her back on the edge of the bed with him holding her legs up and against his chest is good too (unless he's really short or her legs are really long and she kicks him in the head) but don't forget to pay attention to the angle of penetration or provide some extra clitoral stimulation cuz i'm sure she wants to do something other than lay there with her bare ass hanging off the bed.
sitting on the edge of a table, counter or depending on the height...couch or edge of the bed with him kneeling or standing between her legs and rocking forward into her is good too.
i'm extremely self conscious about my body (mostly just my tummy) now that i've lost some weight and for some reason he would rather see me naked than me wearing a tshirt during sex so i'm always looking for positions where i can sorta "hide" my body without being totally obvious and wearing half dozen layers of clothes to bed.