Tip #18: To increase sexual energy and elevate desire, take rapid, rhythmic, and shallow breaths through the nose. Keep your mouth closed. Do this before or during sex. Technique called “Breath of Fire
Similar technique (with similar name as well):
"Fire Breathing" - You can be aroused to a higher lever with "Fire Breathing" by lying on your back, knees bent, feet well spread. Imagine a large intake of air going all the way from your lips down to your genitals. When exhaling, imagine pushing the air back through your genitals and out of you body. Do this about a dozen times, then breath rapidly from your belly with your mouth open. Do this several times then begin breathing through your nose and out your mouth continuously.
Imagine a circle of fire, beginning as a small circle then expand the circle to include chest belly and eventually the genitals.
You should feel an erotic heat moving throughout your body.
Sounds complex but it works! Just give it the chance.