Lerner and Laurence Steinberg state that researchers also "rarely disclose how they define sex or even whether they resolved potential discrepancies in definitions of sex". Coitus interruptus There are a variety of safe sex methods that are practiced by heterosexual and same-sex couples, including non-penetrative sex acts,   and heterosexual couples may use oral or anal sex or both as a means of birth control. This behavior is characterized by a fixation on sexual intercourse and disinhibition. Untreated gonococcal infections result in miscarriages , preterm births and perinatal deaths. Age of men at sexual initiation in these societies is at lower ages than that of women; this group includes Latin cultures, both from southern Europe Portugal, Greece and Romania are noted and from Latin America Brazil, Chile , and the Dominican Republic. Addiction to sexual intercourse is thought to be genetically linked. Untreated chlamydia infection can lead to female infertility and ectopic pregnancy. However, doctors caution against the unnecessary use of these drugs because they are accompanied by serious risks such as increased chance of heart attack. Those with ID may have hesitations regarding the discussion of the topic of sex, a lack of sexual knowledge and limited opportunities for sex education. Women with Intellectual disabilities ID are often presented with situations that prevent sexual intercourse. Those seeking treatment will typically see a physician for pharmacological management and therapy. Consensual sexual intercourse is not always an option for some.