Now that humans live 80-120 years and possibly forever, it only makes sense that relationships would evolve from the one currently acceptable model, "life-long" monogamy and the antiquated tool of political control, matrimony. What does it mean now anyway, until uploading or suspension do us part?
Physical intimacy, emotional intimacy and companionship can (and in reality do) come from many interpersonal and other sources, both physical world and digital and could be better fulfilled with greater realization of their distinctness. Polyamory, led by the tech-innovative Pacific Northwest, is an interesting alternative model, where the level of communication and personal emotional management required is exemplar. There appears to be an important self-evolution to move beyond jealousy and reap the relationship rewards of polyamory and compersion.
Higher levels of self-actualization may be possible by separating and expanding ideas of physical intimacy, emotional intimacy and companionship which have been traditionally bounded by scarcity, control and artificiality.
The future of sexuality further changes in all aspects of culture when traditional physical reproduction becomes obsolete. Sexuality could be more about authentic agency instead of bartering, obligation, power and status.