If you are being read fairly consistently as a man (or as a boy if you appear younger), and walk into a men's room with confidence and purpose, you probably will not raise any eyebrows
Introduction For many trans men, using the men's room for the first time is a big step in the transition process. This section provides information on using the men's room safely, as well as on methods and products that can be used to urinate while standing.
It should also be noted that certain genital surgeries can include a procedure called a "urethral hookup" or "urethral lengthening," which allows the recipient to urinate through his surgically constructed penis
Details of such surgical procedures are not covered in this section, but are covered in the section on genital reconstruction surgery.
Men's Room Etiquette While women's restrooms often involve social interaction and keen observation among the women who use them, men's restrooms are usually more "down to business." That is, most guys in the men's room don't look at one another for more than a second (if at all), there usually isn't much chatting going on, and the vast majority of men aren't scrutinizing carefully who is using the bathroom at any particular time. (more…)