The phrase "went to bed with" is a colloquial way of referring to sexual intimacy with another person. However, there are other more appropriate expressions to be used in more formal or professional settings. These include the verbs "had sex with," "slept with," or "made love with." Other more subtle expressions such as "spent the night with," "shared a bed with," or "had intimate relations with" can also be used. It is important to choose the appropriate expression depending on the context and audience. Using the right words can save you from embarrassment while still being able to convey the intended message.