My Boyfriend is Bisexual - Insecurities

Hi! I need some help on some thoughts I´m having lately.My Boyfriend and I are dating for some weeks now - it is the most wonderful, easygoing, loving relationship I´ve ever had. I am madly in love with him and i think he feels the same towards me.I absolutely understand and agree that sexuality is a spectrum. I for example know that i find girls attractive to a certain extend. But since i am (probably counciously) looking for a emotional connection / relationship with a man I identify as Gay, since the "desire" I´m having towards women is just not enough for me to pursue that.My Boyfriend however identifies as Bisexual. Which I absolutely should have no problem with- or at least wish i wouldnt have. He told me that he sees his sexuality as somewhat in fluidity throughout the sexual spectrum. Going from gay to straight and inbetween. He said he sometimes would wake up in the morning and feel like watching porn for example. Some days he would wanna watch straight porn- sometimes lesbian porn- sometimes straight porn and so on. That is absolutely fine since i believe that what people look for in porn does not necessarily define their sexuality (stimulation of fantasy etc.)We talk very openly and we are both open minded in terms of people having very individual sexual preferences etc. We both pursue the dream of a long-lasting monogamous relationship though.And again as much as i want to be chill, accepting and understanding of his sexuality as i basically am with everybody else i´d encounter. I cant help but feel a little insecure (and i hate it).Sometimes i find myself thinking where i stand in his "fluidity". I start overthinking his attraction to men and women. Wondering if I as a man will be sexually satisfying to him in the long run. Or if he will want to have sex with a woman just because he feels a sexual desire towards a girl or even simply female anatomy. I am wondering about wether he wants to have children or not. Wondering about straight relationships having a lot less social harships than gay relationships.I told him a little bit about it(dont want to be the crazy jealous boyfriend about it) and he tried comforting me- reassuring that he wants to be with me and that he thinks of his sexuality not as beeing attracted to everything at all times but more that he is not primarily concerned with the genitals of the person he loves.Before it gets too confusing and long. I should be happy and enjoy this wonderful relationship i was lucky to find- yet I cant get over my insecurities. Has anyone experience with a similar situation? Or does someone has a similiar idea about his sexuality as my boyfriend?Appreciate all the help guys :)