WARNING: Contains sexually explicit content. When the school district was approached by a father, the spokesperson acknowledged that the information on the poster could seem inappropriate "out of context." I see nothing else around this poster in the photograph, so it was apparently viewed in the context of a "stand alone" poster.
I realize many people have different definitions of what is lewd and what is acceptable, but sex education for 13 year olds needs to be kept age appropriate, which really should not involve teaching about activities other than scientifically presenting "baby-making" intercourse, and should not be suggesting that! Actually, sex education in the public schools should be contained to biology, which covers puberty, reproduction, and disease.