My boyfriend gets upset that sometimes my vagina is looser than other times. He thinks I’m cheating, but I’m not. What’s going on?

Here are five possibilities:

1. Some men tend to be anxious about their sexual performance. Some have an exaggerated sense of jealousy. It’s always best to discuss such problems with a partner. But some men may put the blame on their partners because they are unable to recognize their own insecurities.

2. Women’s vaginas are less elastic when they are not sexually aroused. They become more elastic — “looser” — the more sexually excited they become. A woman may feel “tighter” to a man when she is less aroused, less comfortable, and having less pleasure than her partner.

3. Hormonal shifts during a woman’s menstrual cycle affect vaginal secretions and may affect vaginal elasticity. She may feel “looser” on certain days of her cycle than on others.

4. Certain drugs, such as antihistamines or marijuana, may make the walls of the vagina feel dry so they seem “tighter.”

5. A woman’s vagina may feel tighter or looser in different positions for intercourse.