This is deception. They are lying. These evil voices are playing tricks on you.
Try to ignore as much as possible. That means the visions of sex and also the voices themselves.
Think on positive things. If you keep saying banana I can concentrate on apples, etc. You can think other things while this is going on. Think about healthy things and don't think about sex.
I have accepted Jesus as my Lord and Savior. This has been the greatest help I've ever recieved.
I've been going through this for about two years. I still hear voices all day long, but I remain healthy. They will eventually tire of dealing with me, because all I say in return is "ignore" and "My Lord rebukes you."
Would you like to hear more about Jesus?
Please read the New Testament. Pray for forgiveness and ask Jesus into your heart and pray to recieve the Holy Spirit. Ask to be saved. Beleive in your heart that Christ died for your sins. Walk upright morally and when you sin pray for forgiveness. Always run to Jesus. It's a great comfort to know he also was tempted by the Devil and succeded. I hope I see you in Heaven when this is all over with.
God will hear your prayers. Pray.