Actually, I do not think that it is an entirely crazy idea. According to the Kama Sutra, the bristles of a certain insect used to be used in ancient India to deliberately cause swelling of the penis.
See
http://www.kamasutra-sex.org/text/kama702.htm
Note: The Indian word for penis is "lingam" and the word for vagina is "yoni".
See
http://www.kamasutra-sex.org/text/kama702.htm
Note: The Indian word for penis is "lingam" and the word for vagina is "yoni".