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It depends on the circumstances as to why he would be exposing himself, but it could be considered indecent exposure, a petty misdemeanor. Under the law, indecent exposure occurs where..."the person intentionally exposes the person's genitals to a person to whom the person is not married under circumstances in which the actor's conduct is likely to cause affront."
If your son just happened to see the boyfriend naked because they were taking a shower together, for example (and there was no inappropriate touching) or because he stumbled upon him using the bathroom, that is not a crime, as there is no intent to expose himself or to cause offense. If he intentionally strips in front of your son without good cause, that could be criminal, however.
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