During which stage of sexual response do the bulbourethral glands secrete their lubricating fluid?

Question

Quizplus · Accepted Answer

The most obvious sign of the arousal phase is an erection of the penis. This can be the result of an autonomic reflex from stimulation of the penis, or it can be initiated by sight, sound, smell, or even thought. Neural signals cause the arteries in the penis to dilate, so the penile erectile tissues engorge with blood. This compresses the veins carrying blood away from the penis. The net effect of more blood coming in to the penis than leaving is that the penis becomes, enlarged, rigid, and erect. This erection makes penetration of a woman's vagina possible. The bulbourethral glands also secrete their lubricating fluid during this stage.

During Which Stage of Sexual Response Do the Bulbourethral Glands