The more complex concepts and emotions tend to be experienced in a somewhat different manner by different people. The main defining factor in this equation is the people or media that have been a part of a person's childhood. This means that what someone finds unnatural or unethical can be a normal day to day activity for a different person.
In case you feel anxious regarding something that your partner is doing or planning to do, the best thing is to openly express your concerns by sitting down in a one on one environment and having a talk. In case your partner acknowledges your feelings but explains that your concerns are false, you could take that a sign of relief. Sometimes a person can become anxious about an issue that isn't as bad as it looks.