What are ways to prevent sharing someone else’s razor?

If you use a refillable razor, consider stocking up on blade cartridges so you don’t reach for someone else’s razor if your blade is too dull. Having extra blades readily available will also come in handy if someone else accidently uses your razor, so you can simply swap the used blade with a new one to avoid cross contamination. If you use disposable razors, keep a few extras nearby. And, consider placing an extra razor in your travel toiletry bag as well, so you don’t forget one when traveling.
Make sure your razor is also easily recognizable, especially if you live with someone else who uses a woman’s razor. Having a distinct razor can help prevent sharing with someone else on accident.