Typical man.....he needs to put his feelings aside and do what's best for the dog. Geez, your BF isn't getting neutered...the dog is, and seeing where he is human aggressive his manhood can get him into more trouble with the testosterone in his body than anything. No, it won't stop him marking because a dog cocking it's leg is normal as they mature...for most males anyways. however, it will make him more content and he won't go crazy when he smells a female in heat for up to two miles away.
Yeah dont understand why most men have issues with it, so weird to me, but yet I am not a man and they are weird anyway... lol
Pre-neuter my boy lifted his leg on average every 20-30 feet when we were walking. So it felt like 50 times in a few miles of walking, slowed me down and really, half the time nothing would come out cause it was used up, lol. After neuter maybe 3 times in 3 miles...
Now a lot of people say with proper training the same thing could occur, but in my neighborhood there were a lot of people interested in my boy and I knew once he was fixed the risk of theft would go down tremendously. Also, his focus went from having to call him inside from the back yard it would take forever for him to actually HEAR me through his focus. Once he heard me he would listen, but getting him to hear other things and not be so intent on what he was focus on, improved 100% post neuter.
Again, all of this could be corrected with training, but I found the side effects great. I neutered my boy due to the possible cancer risk (that is also debatable) figure why not give him the best I possible could and since I would never breed him, off they went.