You can start by secretly recording what he says.
Virginia is a one party consent state. A participant in the conversation may secretly record the conversation.
See summary at:
https://www.rcfp.org/reporters-recor...guide/virginia
Each time you get him recorded, take it home and transfer it to your computer for safe-keeping.
When you get enough to demonstrate blatant and continuous sexual harassment, send the recordings to the President of the company.
HR will not help you. Nor will your boss' immediate superiors. This will have to come down from the top.
It may take you a few months to amass enough incidents for the President to take it seriously.
Meantime, seek employment elsewhere because there is an even chance that you will eventually lose your job over this. And then you'll have an EEOC claim and you can throw everybody under the bus.

