There has been a decline in sexual interest over the past few decades that is related to the disconnection caused by high tech electronics but also to environmental toxins. Sperm quality and numbers are dropping. Depression is another factor that has decreased libido. We've lost our meaningful purpose in life in our materialistic, narcissistic lives. Connection, giving, loving and caring are important factors that lead to libido. Lack of sleep and our fast paced lives also lead to lack of libido.