How can we collect evidence of cheating?

1, direct evidence (1) video of sexual intercourse, which requires that it can be clearly determined that the two parties who are having sex have not been edited; (2) Photographs of sexual intercourse scenes, requiring information such as photo source, shooting time and place; (3) written approval, written guarantee, letter of commitment, confession, etc. Written by a party having an extramarital affair; In practice, the husband can be guided to review his long-term cohabitation with his lover in the "guarantee" and "repentance", and then notarized as strong evidence to identify "bigamy" or "illegal cohabitation". (4) I recognize the recording, and the actor himself also acknowledges the recording of extramarital affairs, demanding that the recording be true and legal. This requires that the way of obtaining evidence should be legal. In this regard, you can consult a lawyer first and ask what methods can be used and how to implement them. 2. Indirect evidence (1) Children born out of wedlock need the approval of the other party, otherwise paternity test is needed, which is very troublesome; (2) Ambiguous short messages are difficult to obtain, and forwarding is easy to arouse the suspicion of judges-have they been modified and forwarded to you? If conditions permit, the content of the short message can be notarized in time. (3) Witness testimony, it is difficult to independently prove the fact of extramarital affairs; (4) Recorded materials, some voice records related to extramarital affairs; (5)*** evidence of renting a house directly proves cohabitation, but it cannot directly prove the occurrence of extramarital sex. Indirect evidence cannot directly prove bigamy or that a spouse lives with others, so other evidence is needed to support it.