I believe you meant to ask about "threesome," not "threesum." A "threesome" refers to a sexual activity involving three people. It can involve various combinations of individuals, such as three people of the same gender or a mix of genders. Threesomes are a topic of interest and curiosity for some individuals, but it is essential to remember that engaging in any sexual activity should be consensual and respectful of all parties involved. Communication, consent, and boundaries are crucial aspects of any intimate encounter to ensure a positive and respectful experience for everyone involved.