<unk>  is a form of<unk>  that exists when two partners agree to be sexually active with only one another. Being in a long-term<unk> ly<unk> us relationship reduces the risk of acquiring a sexually transmitted infection (STI). It is one of the most reliable ways to avoid STIs. Those who choose<unk>  can be tested before the sexual relationship to be certain they are not infected. This strategy for the prevention of acquiring a sexually transmitted infection requires that each partner remain faithful and does not engage in sexual activity with another partner.<unk>  differs from serial<unk>  which is a current<unk> us relationship that has not been established in the past and may not continue into the future. Serial<unk>  may not result in the reduced risk of contracting a sexually transmitted infection because the past sexual exposures to infection are brought into the new relationship, even though it may be exclusive of other sexual partners. The risk of acquiring a sexually transmitted infection while in a serial<unk> us relationship is the same as the risk of those who have concurrent partners. Those with a greater ability to communicate about their commitment are likely to sustain the relationship. When individuals are<unk> ly<unk> us, and are free from STIs/HIV when they enter the relationship, the risk for being infected with STI/HIV acquisition from sexual intercourse is very low. A<unk> ly<unk> us relationship lowers the risk of HIV, cervicitis, and other sexually transmitted infections. A<unk> us sexual relationship often includes a pledge to stay with the partner and includes the desire for the relationship to last, a psychological attachment and the lack of being able to find another partner. If these conditions remain a priority for both, the "couple is likely committed and<unk> ly<unk> us." Being in a long-term<unk> ly<unk> us relationship with a partner who has been tested and has negative STI test lowers the chance of acquiring gonorrhea. It is also effective for lowering the risk of syphilis, chlamydia and pubic lice. The lack of a more precise definition of<unk>  in the literature confounds the ability to statistically assess its effectiveness.
Mutual monogamy
Uniparental disomy
Non-Mendelian inheritance
Postzygotic mutation
Pseudodominance
Paramutation
Liberation by Oppression
Structural inheritance