While all these people have some thoughts on this issue, hardly somebody of them can clearly operate by well known and scientifically proved arguments that are perceived as a common truth. Biologists, sociologists, psychologists and other professionals do investigate the issue of different sexual orientation among humans, conducting more and more studies and researches in attempts of finding the most reliable answer. Deep studies of the development of diverse sexual orientations in humans begets only new versions, rather than presents a universal explanation
There exist many different scientific studies and methodologies aimed at understanding the factors, influencing human sexual orientation. These factors can be differentiated by two or even three categories, including: social factors, biological factors or “symbioses” of both social and biological factors. Mustanski et al., (2002) in their research review mainly the influence of biological factors on sexual orientation and concludes that biological influences do have impact on human sexual behavior to some extent. While exploring biological influences on sexual orientation, empirical researchers are used to apply two approaches: impact of hormones on development of sexual orientation, and behavioral genetics.
This research was focused on those drugs which were more likely to affect the hormone level. This link was aslo supported previously by Mustanki et al. (2002) because misbalance of sex hormones levels lead to sexual differentiation of the fetal brain. To be more precise, Mustanski et al. (2002: 97) mentions “that prenatal hormones hard wire sexual orientation into fetal brains”. For studying the impact of the use of drugs during gestation, researchers have taken a sample of 5102 mothers and collected reports of mothers and their offspring regarding their sexual orientation. According to the results of survey, less than 15% of pregnant women have taken at least one drug or class of drugs, however there was found little evidence on prenatal exposure to drugs among male offspring (Ellis and Hellberg, 2005). While this theory failed to work in relation to male scion, there was evidence that some drugs did have some impact on sexual orientation among female offspring. These were two types of drugs, which consisted of synthetic thyroid medications and amphetamine-based diet pills (Ellis and Hellberg, 2005). This tendency might be explained by the fact that during the first three months of being pregnant mothers of lesbian offspring did consume high doses of drugs prescribed. From this study there have made a conclusion that prescription drugs such as mentioned above have influence on the immune system of developing female fetuses. Immune system may impact on the processes of feminization of the brain among males, and masculinization of the brain among females. These “reverse” reactions of the brain might result in different sexual orientations of offspring.