I recently came across some images on Google when doing a search under "Reiki" for a pic to put up on my Reiki Facebook page, and saw several pictures of hand positions that I'd never seen before. So I posted them on in my Facebook group page and asked if others in the group had heard of, seen, or used any of these positions.
The feedback I got surprised me. Apparently, working in the breast area (and I would assume around the groin area as well) can be perceived as a threat, and will illicit a reaction in the sympathetic nervous system. Obviously, we would not want anything we are doing during a healing session to be perceived as a threat. This would be very counterproductive to what it is we are trying to do for our client, help them relax. Relaxing into the session is so very important as it has a lot to do with the receiver's ability to allow the energy to flow.
Now you're probably thinking to yourself "DUH", and on some level I can definitely say that I personally would be one of those persons perceiving it to be a threat, being a rape survivor. I've had people just clap their hands right down onto my chest (thymus area) and I've felt myself tense up and have wanted to say "move your hands", but didn't because I knew the person and knew their intention was pure, but still I was very uncomfortable.
But do we really think about how our client (receiver) is going to react when we place our hands on their body when we are coming from a loving and care-giving place? Are we really thinking when we place our hands on their bodies in "sensitive" areas that they might perceive what we are doing as a threat when we do it?
There is also another position to treat both the sacral and root chakras I picked up from another book. If you're standing on the right side of the receiver, place your left hand horizontally over their abdomen level with the navel, getting the tip of your middle finger as close as possible to the navel. The right hand is placed right over the hip joint vertically and you should have your right fingertips under the heel of the left hand if possible. You will actually feel an indention in the body where the hip and leg come together that the heel of your hand will just fit right into. (from "Reiki Hands That Heal" by Joyce Morris).
For the heart area, just hold your hands about 3" or more above the body, with one hand overlapping (so under the other hand at the heel of the hand), fingers together, thumbs in, and work in the aura.