There are many different ways to describe having had sex with someone, and each one can carry its own implications and nuances. Some common synonyms for the phrase "slept with" include "hooked up with," "made love to," "had intercourse with," "had sex with," "banged," "shagged," "boinked," "boned," "screwed," "did the deed with," and "got intimate with." Depending on the context and the tone of the conversation, some of these phrases may feel more appropriate or less crude than others. Ultimately, it's important to choose words that accurately convey the meaning you're trying to express while remaining respectful and considerate of others.