Opportunistic infidelity occurs when a partner is in love and attached to a partner, but surrenders to their sexual desire for someone else. The opportunistic infidelity is driven by irrepressible lust, situational circumstances and/or opportunity, and sometimes, pure risk-taking behavior.
Obligatory infidelity is based on fear that refraining from someone's sexual advances will result in rejection, and being unwilling to handle such rejection, resulting in surrender to them. Some people end up cheating solely on the need for approval from somebody, even though they still hold a strong attraction to their committed partner.
Romantic infidelity occurs when the cheater is in the process of "falling out of love" with his/her partner. The person's self-perceived obligatory commitment to the relationship's tenets and overall life-meaning is likely the only thing still keeping them with their partner in this example.
Conflicted romantic infidelity takes place when a person both falls in love with and has a strong sexual desire for multiple people at one time, even though s/he may already be committed to a partner. In this circumstance the person feels s/he cannot tell his/her committed partner about what has happened, but is nevertheless unable to resist the compulsion; this lack of open discussion is usually what separates conflicted romantic infidelity from things like a well-defined open relationship or polyamory.
Commemorative infidelity occurs when a person has completely fallen out of love with their spouse, but is still in a committed relationship with them.[66]