12 - No
13 - No
14 - No
15 - No
16 - No
17 - Yes
18 - Yes
19 - No
20 - Yes
21 - Yes
22 - Yes
23 - Yes
24 - Yes
25 - Yes

And why did you exclude head from sex? It's sex, just like pot is an illicit drug.

"Stephen Wolfram is the creator of Mathematica and is widely regarded as the most important innovator in scientific and technical computing today." - Stephen Wolfram