Finding synonyms for the term "have relations with" can be a tricky task, as it can have both positive and negative connotations depending on its context. That being said, some alternatives to this phrase might include: have sex with, engage in sexual activity with, sleep with, make love to, hook up with, get intimate with, have a fling with, or be intimate with. It is important to note, however, that each of these phrases can still carry different implications depending on the situation and the individuals involved. As always, it is important to communicate openly and honestly with partners about one's intentions and consent.