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Because of the aforementioned factors, medical sources advise the use of condoms or other effective barrier methods when performing or receiving fellatio with a partner whose STI status is unknown. This species is the only non-primate known to exhibit this behaviour. The study concludes that people who had one to five oral sex partners in their lifetime had approximately a doubled risk of throat cancer compared with those who never engaged in this activity and those with more than five oral sex partners had a 250.
3 4 People may use fellatio as foreplay to sexually arouse their sex partner before vaginal or anal intercourse, or other sexual activity, 3 8 or they may use it as an erotic and physically intimate act in its own right.