If a 18 year old guy gets a 15 year old pregnant can the guy get in trouble?
depends where you live.
If a girl gets pregnant by an 18-year-old guy or older can she and that guy get married without her parents' permission and without him getting in trouble?
If both of your are 18 or older, then yes. You can get married and do whatever you want without anyone getting in trouble and without any permission. If this 18 year old guy got a minor pregnant, then he can get in trouble for "statitory rape" if the parent of the girl wishes to press charges. In the state of Texas you cannot unless you have an emancipation.