Tokyopop: Happy Mania
By the same author as Flowers & Bees. Written for a different audience (josei as opposed to seinen) there is less deliberate fan service but there is still plenty of full nudity (no genitalia) and sex (including oral sex and lesbianism).
A hilarious satire of the 'I want a man' mindset, this is a truly adult work for intelligent writing and not just 'naughty bits' (though it certainly has those).
Published with a M rating and warning of explicit content.
It's 2005 not 1875.
Viz: Stop editing manga!