Because Slaanesh and Tzeench used to be married but got divorced because Slaanesh couldn't keep her pants on with Korn... And so through a short and bloody court battle, Tzeench gained custody of the children. (Slaanesh gets the weekends with them under observation from Nurgle, Tzeench's new civil partner).
Comments
Best I could come up with...
The ever so confused god of Thai Lady Boys
http://www.ebay.co.uk/itm/Blood-Angels-SANGUINARY-GUARD-5-X-BARE-HEADS-No-Helmet-Hair-Bits-40K-/400444725234?pt=UK_Toys_Wargames_RL&hash=item5d3c5d97f2
OR
http://www.ebay.co.uk/itm/MAXMINI-Marines-Chaos-Noise-Cultists-Space-BNIB-Sonic-Helmets-10-/310643863744?pt=UK_Toys_Wargames_RL&hash=item4853d130c0
They have cool heads.
http://www.games-workshop.com/gws/catalog/productDetail.jsp?prodId=prod1710144a