Dating with kids

I knew dating with a child would be hard but this has become a challenge. Everyone knows I am an overprotective, high-strung mother (I know) but I can't help it. I have dated about 3 guys this year and none of them have met my son. They have asked and I always say "No." It is hard enough for me when a "relationship" ends and it would be even worse if my son is involved. So when is the right time to introduce a man to your children? If I were to answer, I'd say right before you walk down the aisle. Lol. Of course before marriage, a man has to meet your child eventually but it seems so tricky these days. For example, a guy I met online lived a ways away so it was already hard to see each other and then I have my son 99.9% of the time. Do you know this fool suggested he meet myself and my son at Chuck E. Cheese? First off, everyone knows my distaste for that place and I don't even go there and second, I only met the guy once. One guy wanted me to bring my son to a bar, yes a bar to watch an LSU football game last year. SMH!!! I have heard many guys try to use the child to get close to the mother. I don't know who does this, but that would never work on me. I have read articles online about this topic and most of all of them say the same thing that you should introduce your child/children to a man when you are in a committed/exclusive relationship and see a future with this man. A lot of women see this the first time they meet a guy which is why they have different men in and out of their child's life. This just isn't a good thing having strange men around your children all the time and personally I feel a certain way especially if you have daughters. Just not a good idea. I already feel guilty with my son coming from a broken home and hope it doesn't cause too many issues with him and you know how close boys are with their mothers. I have an internal struggle everyday about this and just pray my son will not be effected by my dating life. He is so young right now but these kids are so much smarter than we were at this age. With my custody schedule it should be easy to date when my son is with his father however, it is not. So what do you do if you want to go on a date and have your child? I recently was asked out on a date and had my son. His father lives in a different city and couldn't watch him so I asked my date if he would pay for my sitter? Now it is only $25 and it's not like I can't afford it but I feel if he really wanted to go out with me he would make an effort and he agreed. Dating is already hard and then having a child makes it even harder. So when do you think a woman or man should introduce their children to someone?