1. Aroused from sitting on partner's lap

2. Tickling while asleep

3. Moaning the other's name while asleep

4. Caught doing prostitution

5. Caught with a buttplug in

6. Caught with a sex toy stash

7. Drunk sex

8. Caught as a supernatural being (usually cat-person)

9. Knocking at midnight

10. Coming out

11. Punishment

12. Caught crossdressing

13. Caught masturbating

14. Just wants to lose virginity

15. Asking to buy them sex toys

16. Tempted by revealing clothing

17. Meeting charismatic stranger

18. Sex "for science" excuse

19. Cat-person in heat

20. Gift-wrap bondage for birthday present

21. Falling over into a compromising position

22. Sneaking away from a party together

23. Celebratory sex

24. Drunk confession

25. Teasing with a revealing outfit

26. Found smut/porno mags in room

27. Taking a bath together

28. Breaking into house and begging for sex

29. Same bed cliché

30. Walked in on sex only to be invited (threesome)

31. Overly obedient servant

32. Desperate, says yes to any request for sex

33. Masturbating to another character

34. In sauna with crush

35. Self-appreciation in mirror

36. Wake up to the future to find out you're married

37. Pestering the other for attention

38. Groping in the backseat of a car with other people inside

39. Under the dinner table groping

40. Magic spell causes all people of the preferred gender to fall in love with you one day

41. Cuddling and watching movies

42. Spitroast (sucking while getting fucked)

43. Character gets a boner while spooning

44. Honeymoon sex

45. (Female) character gets drenched underwear being around partner

46. Couple films sex tape

47. Films masturbation videos/streams

48. Gloryhole

49. Sex toy gift for partner

50. Tentacle monster summoning

51. Inviting crush to star in your porno

52. Found their onlyfans

53. Lapdance

54. Breeding kink

55. Stuck under the bed

56. Shy while asking for sex

57. Dirty talk in public

58. Sexting/phone sex

59. Violating an oath of celibacy

60. Blowjob under desk

61. Getting fucked under desk

62. Sex after being away for a long time

63. Trying out each other's kinks

64. Cramped disaster shelter sex

65. Waking up next to someone with no recall of the night before

Some extras people added in the comments

1. Sneaking into a pool after hours

2. Broken down car in the middle of nowhere

3. Accidentally drinking your own aphrodisiac

4. "Accidentally" giving them aphrodisiacs

5. Camping

Some I thought of after the fact

1. Sex/oral while gaming

2. Movie theater sez

3. Rock-paper-scissors strip game

4. Transported to the other's wet dream

Some SFW ones

1. Taking care of them while they're sick

2. Complaining about life while being comforted

3. Dramatic breakup

4. Defending partner after they're catcalled

5. College/highschool group project

6. Pet suddenly turns human