"Cullions" is an old-fashioned and obscure term that refers to a person's genitals. It's not a word that is commonly used in modern English, and as such, there are not many synonyms for it. However, there are several other words that can be used to refer to a person's genitalia, such as "genitals," "private parts," "groin," "penis," "vagina," "testicles," and "scrotum." These synonyms are more commonly used in everyday speech and writing and may be more appropriate to use in most situations. It's important to consider the context and appropriateness of language when discussing sensitive topics like this.