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.
  Oxytocin is sometimes known as the cuddle hormone because of its influence on maternal behavior and pair bonding. It is found all over the brains and reproductive syste â¦ ms of both sexes. Oxytocin is produced naturally in the hypothalamus in the brain.It hormone that affects the brain as a result of its interactions with gonadal steroids like estrogen, progesterone, testosterone and corticosterone. This hormone is key to pair bonding. Oxytocin is sometimes known as the cuddle hormone because of its influence on maternal behavior and pair bonding. It is found all over the brains and reproductive syste â¦ ms of both sexes. Oxytocin is produced naturally in the hypothalamus in the brain.