Dear friend, I appreciate your for writing this question. Primarily, Masturbation does not cause curvature in the penis. Curvature happens due to reasons that you might have already researched online. Most often people are able to have intercourse while having the curvature to the permissible degree. It would be an accurate judgement if the curvature is manageable or not only after considering your experience of intercourse. You can also consult your physician or Urologist to have a discussion about it.