There is a girl at the gym who trains her glutes all year round; the squat rack is her main equipment.

One time after training, she forgot to bring a towel, and her personal trainer lent her his.
That towel belonged to her brother-in-law.
Her sister is a yoga instructor next door, and her husband is the head personal trainer at this gym.
That day, her sister was on sick leave due to a cold, and after finishing her class, her brother-in-law left the towel on the equipment.
She casually picked it up to wipe her sweat.
Two weeks later, when she found out she was pregnant, she was completely collapsed on the ground.
She is single, has no boyfriend, and hasn't been held by anyone’s hand in three years.
Her brother-in-law was suspended from scheduling classes and is under investigation; he’s about to lose his job.
Both insist that nothing happened between them, and she also went to the hospital for a check-up—her hymen was intact.
Finally, the gym’s locker room surveillance footage was reviewed, and combined with the estimated pregnancy week, the most plausible explanation is:
She finished her glute and leg workout, used her brother-in-law’s towel to wipe her legs, and traces of what he used during intimacy with her sister in the car at noon remained on the towel.
When she wiped herself, those residues were rubbed along her skin’s texture and entered her body.
On the day the investigation results came out, her sister took the towel out of the evidence bag, washed it clean, and placed it in the yoga bag’s inner pocket.
Then she went to the personal trainer’s office to find her husband, saying she wouldn’t divorce him.
Not because she trusts him, but because her sister told her that the thing she fears most in her life isn’t pregnancy, but losing her sister.
Her husband asked, “Then what are you still afraid of?”
She said, “Right now, I only fear one towel.”
Later, she brought that towel back into the hot yoga room, laid it on the mat, and after class, folded it and placed it in the outermost compartment of the locker.
She told the new students not to use someone else’s towel to wipe sweat.
One student asked her why, but she didn’t answer, only rolled up her pant leg and looked at her old scar—
That scar was from years ago when her husband first helped her wrap a towel too tightly while she was training with equipment, leaving a mark.
The mark had long faded, but the towel was still the same one.