God has seen in His infinite wisdom to wire males in the certain way to make us very visually seeking beings, and also to make us be physically seeking beings.
i don't want to downplay females or anything, i know that God has created us all as sexual beings. He has provided that as a gift to us, as a blessing.
satan uses everything he can to get us to take our focus away from God, as subtle and as slight as it may be. in the case of guys, he uses one feature of us to be one of our greatest hinderances.
as a guy myself, i know what it was like to fall into the temptation and sin of pornography. praise to the Lord, He has helped me cease this horrible habit. there are a couple pressure points that satan pushes on us that makes it that much easier for us to fall. one is that it is so easy to get to. on the internet, access to just about any information is really easy, and pornography is no exception. people realize that this sells, so it is just EVERYWHERE. so satan likes to dangle it around everywhere. he also likes to make us think that, it doesnt effect us, or anyone else. obviously as you can see, it doesn't. it hurts you, and it does hurt him. so we think we're in this little bubble, where its just us and whatever is in our imagination, and God reallly isn't going to kill us or anything. so satan likes to play the 'who will know?' card.
there is a lot to it, but i am done for now. i hope i have helped a little bit.
in explaining what are some of the specifics, you can see what needs to be addressed and talked about, in order to help him pass the temptation. offer everything up to God. ask to pray with your bf about it. God will move hearts
the most important thing is starting with God, and also prayer. Philip. 4:6 "Do not be anxious about anything, but in everything, by prayer and petition, with thanksgiving, present your requests to God."