It should be commended. Too often in this modern society we live in people try to grow up too young, and partake in activities they are not emotionally equipt to deal with. Nor are they equipt to deal with the consequences.
As for how and 18 year guy would react to it, well you can imagine, with an immature mentality that all us guys had when we were 18, they’d think it’s great, they get first “shot” (don’t know what else to call it).
But as far as a guy you have feelings for, and who has feelings for you, it should be seen as a good thing for more pure reasons.