yeah, RARE = infrequently used, unusual

as it is mostly and mainly used in/for ...
(but not limited to)

1. gauging a woman's vital statistics...
easy mathematics 36-24-36...

2. sports, easy math again for the scores...

3. remembering how many GF's and one night stands he had...

4. sexual fantasies and encounters and blunders...

5. uuhhh the vital centers too, for breathing, etc...
good thing it is involuntary as he might forget to breathe coz of too much clouding from s-e-x

T R U C E M A N