1. There is no situation or episode after which it is too improbable or even impossible for Mulder and Scully to have sex. Cancer, for example, is a good aphrodisiac, as is the death of a family member.
2. Mulder and Scully often have long, in-depth, open conversations about their feelings, though these always happen off-screen. These also, invariably, lead to sex.
3. What we see on screen only scratches the surface of how crazy Mulder actually is. It is amazing he can function at all on a day-to-day basis, much less still be an FBI agent, with how much insanity is lurking in his head.
4. Much of this insanity is related to Mulder’s profiling ability, which isn’t just spooky, it’s darn near supernatural. Mulder often loses himself in the mind of a killer, and Only Scully Can Save Him from the Abyss (And Then They Have Sex, aka ATTHS).
5. Mulder and Scully suffer almost constantly from nightmares. These always require comfort from the other, which means sex.
6. Mulder and Scully are magnets for car crashes. It is a rare car trip that does not result in an accident, a hospital stay, recuperating at home – ATTHS, of course.
7. In fact, Mulder and Scully are constantly being shot, stabbed, or otherwise critically injured, even beyond what we saw in the show. Again, this results in time spent being cared for by the other, ATTHS.