To do this, you need to download the Zip file for photography, which you can download in here . You definitely need a realistic set of dildos from Noir and Dark Sims and the Teleport Any Sim mod.
This pose pack adds all child traits from CAS to the pose player. While the child trait list itself doesn't differ much from the adult trait list (some missing), this pack will use the child version of the animation when there is one so there won't be any distortions or floating sims.
This pack consists of 4 in-game poses, a total of 8 single poses. They don't need to specifically be for couples, they work great with 2 sims that are T/YA/A/E.