At the risk of being horribly commercial, I discovered an interesting product that facilitates sex and sigil magick. I received a Tenga Egg masturbation sleeve as an after Christmas gift. After taking the wrapper off to reveal the container had a perfect white surface easy to draw upon, it immediately struck me that the device could be used for charging sigils.
The last picture is a healing sigil drawn on the egg. It seems tailor for adding sex energy to the sigil.