"...I'm not sure if it would stop me..."

Be very careful doing that. Victims, 'specially if the rescuer is getting too much air into their stomach, have a tendency to upchuck, right into your mouth if you don't have a mask. That is why they invented the one way valve. Rough it would be, but in todays world, there are kids being born with AIDS and other nasty things every day. I will not go bareback on anyone I don't know, period...