Ruined Orgasm [Old title: Post Orgasm]

[garoto]

Good afternoon,
Sometimes I can (before orgasm), come a little (without the pleasure of orgasm). But only a little...
How can I manage doing this more times? (indeed I can't find tha way to do it)
Does it has something to do with letting relaxed the muscles of the penis ?
I try letting them calm, but it seems that they force to press themselves... and it ends with an orgasm,
Thank you