Is it normal that my boyfriend and i suck cocks together?

My boyfriend and I have known each other all our lives and we socialize in a very tight group of people who have grown up together. My boyfriend and I have taken to experimenting with other people sexually which led us to having sex with a mutual friend. We ended up sucking our friends cock together and we both loved it. We sucked him until he came into both of our mouths and then we kissed passionately and swapped his cum between our tongues. I had never been so turned on and all three of us were in a sexual frenzy. I experienced a very intense orgasm when we sucked my boyfriend off in the same way.

We had been doing this quite a lot the past 3 months, but today my boyfriend said that we should really really stop doing this, not because it was wrong but because too much of a good thing is really a bad thing. He said he was afraid that we would become used to doing this and would eventually graduate to other sexual behavors that at one time we may have never considered doing. He told me that when engaging in frequent and excessive sexual behavor that we stood the risk of sexual addiction, that if that happened we would be forever seeking greater and greater sexual thrills, never being able to really be satisified when engaging in typical sexual activity. He told me it would be much much better to do things like this only occasionally as then it would be more special and not just be a blur of forgotten promiscuous sexual experiences. I informed him that he was 10 years older than I, and had a *lot* of sexual experiences, and I wanted to have some experience like he had. He agreed that I should explore my sexuality, but given that he had seen excessive sexual behavor turn into a monster that lives on one's back and could rob individuals of the ability to have a fulfilling monogamous relationships. He wants to sets limits on what and how much we do saying that the quality sexual experiences are much better than frequent ones.