You both climax at the same time.
Circumstance depending, it’s common knowledge that women take more time to reach the grand finale at the firework show (if you catch our drift). Reaching that peak at the same time often considered one of the most romantic things that could happen during intercourse. However, the likely-hood of that actually happening is very, very rare. Studies show that men tend to climax first during intercourse, whilst women can take up to 15 minutes or longer to reach that same level. So, if you and your girl seem to climax at exactly the same time frequently, it’s a strong sign that she’s faking it.