During an open discussion lunch today at a high school I gave the kids a choice between “Arousal” and “Relationship Conflict”. All the students chose arousal except for one guy that complained about his “asshole” girlfriend. I started off by explaining undifferentiated genitalia and which parts of the male and female genitals came from the same tissues (glans clitoris=glans penis, labia majora = scrotum, etc.). Here are some crude but effective charts for easier reference.
The Sexademic 