Imply vs Inferbut any reasonable person understands a nonverbal yes
The difference between the meaning you are sending out and the meaning that is decoded by the person receiving it.
Yes there are many universals in human body language and in our physical/sexual relationships they are often backed up & enhanced by chemical messages. But it isn't always clear and simple messaging.
Women are becoming sexually viable at younger and younger ages. It is common now to hear of girls that start their menstrual cycles as young as 8 or 9 years old - and are showing the secondary sexual characterizes - pubic hair, breasts, etc.
So at a chemical level (nonverbal) their bodies are putting off the messages of being an available female for up to 10 years before most of society says it's OK to have a baby. So a woman 18-20ish could really be honestly sexually frustrated at a physical level. Her body is peaking in reproductive ability and her society is telling her to go college or get a job and have babies later. So that's mixed message #1
Mixed Message #2
The young adult brain and the adult brain are physically different and do not reason in the same way. There was a program on public television last night about how the teenage brain doesn't decode nonverbal messages very well.
http://www.pbs.org/wgbh/pages/frontline/shows/teenbrain/interviews/todd.html
Basically - the program showed that young adults process nonverbal messages more in the pre-frontal cortex than in the frontal cortex where adults process them. So teens are actually responding with more emotion and less reason than adults AND they're more likely to make mistakes in decoding those non-verbal messages.
Now - date rate doesn't only happen to young women and isn't only committed by young men. But as date rape is on the rise and much of that population is younger - I think the things I've brought up play a role.
So Bill - I think your comment works for adults 25 and over. They're all speaking the same language - physically, chemically, and cognitively. However - for those under 25 there is still lots of room for those nonverbal messages to be misread. AND, we all make mistakes - even with verbal messages so that has to be room for even more error in nonverbal message interpretation.
Add to all this the well known (and now being studied) fact that there is this big disconnect in the young adult brain between actions and consequences and you've got a recipe for even more mistakes and poor decisions. Mixed Message #3.
Finally boys are on the "go forth and conquer" mindset and girls are raised with the "keep your legs crossed" mindset despite what their bodies are asking for. And there's Mixed Message #4.