Whether it is acceptable to massage naked in a health center depends on many factors such as personal values, cultural background, religious beliefs and so on.

In the process of massage, nudity is not necessary, but attention should be paid to health and safety issues. Naked massage is acceptable if the masseur in the health center provides appropriate protective measures and abides by relevant health and safety regulations. However, if the masseur fails to provide proper protective measures or violates relevant health and safety regulations, then this massage is unacceptable.

In short, whether it is acceptable to massage nudity in health centers needs to be comprehensively considered according to personal values, cultural background and religious beliefs.