The phrase "go all the way" typically means to engage in sexual intercourse. However, there are many different ways to express the same idea without using such a blunt expression. Some synonyms might include "sleep together," "make love," "get intimate," "hook up," or "do the deed." You could also use more playful or euphemistic language, such as "take things to the next level," "seal the deal," or "go for a spin." Ultimately, the choice of words depends on the context and the tone that you want to convey. However, using more tactful phrases can be a respectful and considerate way to discuss intimate matters with others.