My boobs size is 38 DD. Little sagging. How to bring it back to attaractive?

i am married aged 32 have 2 kids. Before marriage, I had sex with my neighbour for more than 2 years while I was 17 and 18. After marriage I did only with my hubby. My hubby knows my previous affair. But loves me a lot. He does only with me. I have more libido to have sex everyday. It is wrong I know. But I open here to get some remedy. Please understand me. I have a desire to have sex with my brother in law, college mates, colleagues hubby's friends etc. Whenever I see them and talk to them, the whole night I suffer thinking of them. (My hubby gives me full orgasm during every intercourse. He will leave me only after saying enough. He loves me so much. He understands me well) I don't know why? How can I overcome this?