The discovery or establishment of common ground between individuals is a fundamental component for enduring interpersonal relationships. Loss of common ground, which may happen over time, may tend to end interpersonal relationships.

For each relationship type, essential skills are needed, and without these skills more advanced relationships are not possible. Systemic coaching advocates a hierarchy of relationships, from friendship to global order. Expertise in each relationship type (in this hierarchy) requires the skills of all previous relationship types. (For example partnership requires friendship and teamwork skills).

Interpersonal relationships through consanguinity and affinity can persist despite the absence of love, affection, or common ground. When these relationships are in prohibited degrees, sexual intimacy in them would be the taboo of incest.

Marriage and civil union are relationships reinforced and regularized by their legal sanction to be "respectable" building blocks of society. In the United States the de-criminalization of homosexual sexual relations in the landmark Supreme Court decision, Lawrence v. Texas (2003) facilitated the "mainstreaming" of gay long term relationships, and broached the possibility of the legalization of same-sex marriages in that country.

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In intimate relationships there is often, but not always, an implicit or explicit agreement that the partners will not have sex with someone else - monogamy. The extent to which physical intimacy with other people is accepted may vary. For example, a husband may be more receptive to his wife being physically affectionate with her female friend if she has one than with her male friend (see also jealousy).