Ok, I hate to just jump in and post out of desperation but our plumber is here working right now!!

We are moving our master bathroom (along with the plumbing of course), drain and water lines seem to be an easy move but the issue is with the vents. I don't know much (OK, anything) but it doesn't seem right to vent right into the attic. It is a walk in attic (used for storage) with venting in the soffit and also a ventilation fan.

Don't the vents have to go through the roof? Doesn't smelly gas come out of the vent? Is it normal to have a vent on the front of the house or is that just a matter of preference? Can vents go to the side wall of a house (that was his other option for the toilet vent, the sink is running smack dab in the center of the attic)?