You mentioned that sin may be pleasurable for a season, but it is still sin, and to shun the ways of the flesh. I disagree with your assertion that any pleasurable behavior "of the flesh" with a boy is automatically sinful. Is it sinful because of the flesh, or because of the age difference?

Certainly, God requires that we do not take forcibly what others either cannot or will not voluntarily give. It is a sin to take from someone such an intimate gift without giving something in return. God’s sex laws all relate to the issue of treating other people with absolute fairness, consideration and concern for their well being.

There is nothing inherently sinful in the sex act. It is a moral issue for us because we are spiritual beings, and how we treat others is a spiritual matter.

What makes any sex act a “sin?” Since the Bible itself says “where there is no law there is no sin” and “sin is transgression of the law” then nothing can legitimately define any sex act as sin except God’s law!
If no law exists concerning masturbation can that act be sinful? The answer is “NO!”
If no law exists concerning oral sex can that act be sinful? The answer is “NO!”

Nothing is sinful because “it just seems to be wrong.” Subjective opinions, even if followed by the masses, can never establish a thing as sinful, otherwise sin becomes whatever people think it is. Sin is only what God says it is. If God does not prohibit it, it is not sin.

The age difference can pose problems and challenges for any relationship. Nevertheless, I believe the age factor is not as important or significant as the heart factor. God is far more concerned with what is in our heart. Love should be the motivating factor in all that we do. If age were the determining factor in whether a relationship were acceptable to God or not, many adults would have to abrogate their relationship, since there is more than X number of years between them. Of course many May-December romances flourish and survive. Why? Because love, not age, is the basic foundation of the relationship. I understand that the age difference in adult relationships is not as obvious and/or socially unacceptable as the age difference in adult/child relationships. But from my own experience, the issue of age does not negate the validity of such relationships. I know that there are age of consent laws. The age of consent differs from state to state, and lawmakers are incapable of agreeing on the age when a child reaches sexual maturity. (as if they ever had that ability) The truth is emotional and sexual maturity varies with each child. Legislating children to be essentially "non-sexual" until they reach a certain age does not alter the fact that children are sexual beings. Denying them the right to explore, express and enjoy their sexuality prior to the age of consent not only inhibits their emotional growth and sexual maturity, but ensures that many will grow up confused and conflicted, burdened by guilt and shame.

"Let every man be convinced in his own mind." (Rom. 14:5)
Each person must be allowed to have their own conviction before God.

"Happy is the man who does not condemn himself in what he approves." (Rom. 14:22)
If a Christian's own informed conscience is clear about what he allows, then he may "partake with thankfulness". (1Cor. 10:30) God grants to each of us the right to decide for ourselves and to exercise our faith in good conscience before Him with thankfulness. One can live a happy life free from condemnation as he pursues those pleasures he approves. That scripture verse grants outright liberty for God's children to exercise their own best judgment about all things. If a brother feels convicted about sexual intimacy with a boy and your conviction is different, then you are both commanded to honor the other's convictions. You must allow another the liberty to do as they feel and they must allow you the liberty to do the same. Whether you do or don't do a certain sexual act is not the issue. The issue is that whatever you choose to do, "do with praise and thanksgiving to God". (Rom. 14:5-9)

Within the parameters of true love for God I believe we are free to enjoy our sexuality as fully as we desire, in the manner we desire and with whom we desire. Loving God means that we honor His requirement that we treat others as we desire to be treated. Loving boys means that we treat them with respect and dignity, that we demonstrate concern for their welfare, that we do nothing that compromises their safety and well-being or takes advantage of their vulnerability.