Just say you “identify” as a woman, and thus are legally one in the eyes of the law in crazy liberal places like Boston. If they don’t like it, sue.
The insanity of our current society will probably doom companies like Safr, and it's too bad. I think any company in the private sector should be allowed to serve whoever it pleases. It could still be managed if it weren't for the packs of slavering leftists who are determined to destroy the private sector, and the trial lawyers who are more than willing to help them.