My house has no vents for the sinks and bath, smells now that the windows are closed.

Ya got to give us more then that!
How old is your house? How do you know that you have no vents? Has a plumber checked out? What area do you live in? How many pipes do you have coming out of the roof? When the drains leave the traps do they go into the wall or down through the floor? Let me know, Tom