There are numerous synonyms for the phrase "haddest sexual relations." Some of these include "had intercourse," "made love," "slept with," "hooked up with," "had sex," "engaged in sexual activity," "had a fling," "got together," and "made physical contact." All of these phrases convey the same basic meaning: a consensual physical relationship between two or more individuals. It is important to use language that is respectful and consensual when discussing sexual activity. Using euphemisms or slang terms can be inappropriate or offensive depending on the context.