Harry T. Reis; Susan Sprecher (2009). Encyclopedia of Human Relationships. Showick Thorpe; Edgar Thorpe (2009). The Pearson General Studies Manual 2009, 1/e. Pearson Education India. Taormino, Tristan (2009). The large Book of Sex Toys. Kinetics H (2009). Health and Wellness for all times. Freberg L (2009). Discovering Biological Psychology. Bailey NW, Zuk M (August 2009). "Same-sex sexual behavior and evolution". Oxford Dictionaries. Archived from the unique on 27 August 2016. Retrieved 7 August 2015. (Of an individual, especially a man) homosexual. Concise Medical Dictionary. Oxford University Press. The American Heritage Dictionary of the English Language, Fifth Edition. Sexual intercourse most commonly means penile-vaginal penetration for sexual pleasure or sexual reproduction; dictionary sources state that it especially means this, and scholarly sources through the years agree. Amnesty International Policy on state obligations to respect, protect, and fulfil the human rights of intercourse workers. Doty R.L. (2014) Human Pheromones: Do They Exist? in Mucignat-Caretta C. (Ed).
