Hey, Bijoux is a female and yes he will do it it sucks but it's a part of having a unfixed male.
As Pam said if you fix him with some love you can break the habit because the testosterone won't be driving him to mark. I do highly recommend you consider it, unfixed males also have a habit of running away -gates, doors, slipping collars and harnesses when then smell a female in heat. Which to me is a bigger hazard then the knife, talk to your vet and see what your options it may be something to consider.
If you really are too scared to get it done then I recommend a belly band, it won't stop him from trying to mark but it will prevent him from being able to. Just make sure that you use the napkin and change it often sounds like he's a pretty bad marker.
Good luck!
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