What is why would a guy ask when was the last time you had sex?

There could be various reasons why someone might ask about the last time you had sex. Here are a few possibilities:

1. Relationship Context: If you're in a romantic relationship or dating, your partner might ask this question to understand your current level of sexual activity and potentially discuss health or fidelity concerns.

2. Health Concerns: In contexts where sexual health is discussed, such as with a healthcare provider, the question might be asked to assess your sexual health, understand potential risks, and offer appropriate advice or testing.

3. Curiosity or Interest: The person might simply be curious, especially if you're in a context where discussing past relationships or sexual histories is common or relevant. This could also be a way to gauge your openness about sexual topics.

4. Establishing Boundaries: If you're exploring a new relationship, understanding each other's recent sexual history can help individuals set boundaries and discuss safe sex practices to ensure mutual consent and comfort.

5. Jealousy or Insecurity: In some cases, someone might ask due to feelings of jealousy or insecurity, especially if they're concerned about their significance in your life relative to past partners.

6. Emotional Intimacy or Bonding: Sharing personal information, including sexual history, can sometimes be a way to build trust and deepen intimacy in a relationship.

The appropriateness of the question can vary greatly depending on the context, the nature of your relationship with the person asking, and your comfort level with discussing such topics. If uncomfortable, it's important to communicate boundaries clearly.