Even methane (natural gas) is lighter than air, but not by much. Carbon dioxide, which is contained in the air we breathe out and is also easily and safely manufactured by mixing bicarbonate of soda and vinegar, is heavier than air. It tends to sink to the floor and accumulate. So it's a good job that houses aren't air tight.
Cuddling, holding, and sexual play releases chemicals, like oxytocin, in the brain that create a sense of well-being and happiness, says Dr. Renee Horowitz, an ob-gyn who recently opened the Center for Sexual Wellness in Farmington Hills, Michigan.
From the WebMD Archives. Nov. 15, 2010 (San Diego) -- The love hormone oxytocin, known to be plentiful in lactating women and released by men and women during orgasm, appears to do much more, according to new research presented here at the annual meeting of the Society for Neuroscience.