How do I tell him …

Hey guys. This is my first post and I really could use some advice. I have been married for 5 years and I love this man, everything is so fine and we have 2 beautiful kids as well however he is unable to satisfy me in bed lately, I tried to get along with it but it has started bothering me a lot. He likes to think he is great in bed which I don't deny to some extent but he always finishes very fast and that leaves me high and dry. I have spoken to him about it and he promised he would work on it or whatever. We have been getting off to the fantasies of threesomes and swinging etc coz of porn and all but we ain't gonna act on it most probably but lately it's been on my mind that I tell him I wanna be satisfied by him or whatever comes my way. Not that I wanna cheat but | just can't help it. I fee guilty as well as kinda naughty about all this . I hate myself for May be wanting this coz I know if I tell him he would go to any extent for my happiness and I don't wanna force or push him to go any scandalous way but at these time I wanna feel it all over again. I want that fire back !!