Yes, it is considered Sunnah (recommended practice) in Islam for a husband and wife to shower together. This practice is based on hadiths (sayings and actions of Prophet Muhammad), where he is reported to have bathed with his wife, Aisha.
However, it's important to note that this is not an obligation, and there are different opinions on the specific conditions and etiquette surrounding it. Some scholars emphasize the importance of ensuring privacy and avoiding any actions that might lead to temptation. Ultimately, the decision rests with the couple based on their mutual consent and comfort level.