One possible cause is the picture in your post. There are some sexy pictures posted in your site. I remember before, my friend got also a warning from adsense team because of posting sexy pictures on his blog.
The blog mentions the word "ads" "adsense" etc. too many times. Google doesn't like this thing, more specifically known as "KEYWORD SPAMMING". I also had this issue some months ago. I came to know about it when my site suddenly started to display public service ads. I didn't receive any email though.