Looking for responses from those with lifestyle experience and knowledge. I've been wanting to watch my wife take BBC for years now. Around 10 years I think. The idea haunts my thoughts daily to the point that it's the only thing sexually that I think about. I can't even imagine thinking about my wife NOT taking BBC. For the thrill of it I'm all on board. I'm ready to witness her pleasure at the hands (and cock) of a well endowed BBC. She is hesitant due to various reasons such as diseases and the possibility of her falling for a bull. I obviously want to keep my marriage strong as I love my wife and don't want to lose her. I just want to grant her freedom from the confines of marriage so she can REALLY enjoy great sex. She knows it gets me off so good also. So does it work out well or bad more often than not. We have 2 little ones and I don't want this family ruined over a fetish/fantasy.
You ask some very important questions. With regards to how long you have been together, it is no different than what you see in vanilla marriages with regards to how long they knew each other before getting married. There are successful marriages out there where they knew each other for years before getting married just as there are successful marriages of those who knew each other for a very short time. Conversely, there are failed marriages of both varieties as well. IMO, the length of time you have been together may play some factor, but it doesn't guarantee anything really. I believe what is more important is your commitment to each other. I have talked to 1000's of couples over my 25 years in this lifestyle and I have met just as many HS sweethearts as I have people who are on 2nd marriages or had short courtships. What is consistent is their high level of communication, commitment, respect and honesty with one another.
With that being said, let's be honest here. Getting into this lifestyle is a gamble. It is a high risk, high reward type of endeavor and there are no "guaranteed successes". All anyone can do is take the necessary steps to increase their chances of success. I will never mislead anyone into believing that this lifestyle is some type of magic carpet ride that is free of pitfalls. They are there, they are real, and chances are you will encounter a few yourself. The question will be is your commitment to each other strong enough to survive those bumps. With that being said, if you ask the people who are living this lifestyle, most of them will tell you that the possible rewards are worth the risk they took.
Now, to address her/your concerns. As for safety goes, those concerns can be mitigated by utilizing safe sex practices during play. Seek out Bulls who are comfortable with providing recent test results (you should be willing to do the same) as well as using condoms during play. It is also becoming increasingly common in the lifestyle for people to take prEP. You may want to consult with your Doctor before doing so. Now as far as her falling for her Bull, this is something that I have seen happen and I have seen marriages break u as a result of this. There are 3 ways that I have seen this raise it's ugly head:
1) her falling for her Bull
2) her Bull falling for her
3) the 2 of them falling for each other
If your wife becomes a "sport fucker" (someone who doesn't need a deep connection to enjoy sex) then these situations are easier to avoid because she's never playing with anyone enough to get "caught up". It also makes it easier to avoid if she is not seeing the same person consistently. Not a guarantee, just easier to avoid. Now, if on the other hand she is the type who does require a connection to play, then things can be a bit trickier. My advice is to remember this important thing...there is a BIG difference between a Bull and a guy who just wants to fuck your wife. If her catching feelings is a serious concern, then you will want to seek out Bulls who are experienced in the lifestyle. Bulls who know how to navigate these types of situations. Yes, it is harder to find these types of guys but if the risk is that high, then it is worth the time investment.
Of course this is just a "cliff notes" response to your situation and this is generalized advice. If you're interested in getting my perspective on how to address your own unique set of circumstances, feel free to reach out. Whichever route you guys decide to take, I wish you nothing but the best.