Sandfort 1994 has found that boys with only consensual sexual experiences are now more satisfied with their sexual lives, more easily aroused, have significant stronger sexual desire and are less fearful of sexual contact, than boys without sexual experience.
Straver (quoted by Sandfort 1979, p.139) sees three possible effects of sexual relationships with an adult upon a younger partner:
It would be quite wrong, then, to say that most of the benefits of such a relationship goes to the adult. (Brongersma 1990, p.323-324)
There are a lot of possible benefits: "greater inner freedom, better and more complex understanding of himself, less anxiety, less aggression, better sexual information, fewer "adolescent problems", less sexual obsession, a more positive attitude toward nakedness, opportunity to discuss openly the most intimate matters, real instruction and practice in sexual activities combined with tenderness and respect for the partner, non-opressive self-control, a better balanced personality. There is an opprotunity here for a boy neglected by his parents to find a substitute father." (Brongersma 1990, p.324)
Unfortunately, most research mingles such consensual experiences with coercive,abusive experiences. The results of such sexual abuse research does not give much information about consensual, volitional relations. The harm shown in such research seems to be related with coercion, the persecution process and general sexual repression.
See also some discussion.