The term "sex freak" can be considered offensive or derogatory in some contexts. There are several alternative synonyms that can be used to describe a person with a heightened interest in sexual activities. Some examples include sex enthusiast, sex addict, erotomaniac, nymphomaniac, hyper-sexual, or sexually adventurous. It's important to note that while there is nothing inherently wrong with having a healthy interest in sex, it's crucial to always respect the boundaries and wishes of others and obtain consent. Using appropriate language and communication is key to ensuring positive and respectful sexual experiences for all involved.