If only one testicle is inserted, it is termed a Lance.
Bill: Dude, I totally doggy bagged my girlfriend last night.
Ted: Excellent! One or two?
Bill: One ... I Lanced her.
The name derives from the slang word for taking a meal from a restaurant home in a bag, but replacing the meal with semen, and the paper or plastic bag, with a condom for the recipient to 'Take home for later'