Most specialists advise against sexual intercourse after the transfer, either because it produces uterine contractions that would affect implantation, or because it generates a physical effort that would impede embryo implantation, or others.
There are also other currents that attribute beneficial effects to sexual intercourse, for example by stimulating the immunological tolerance necessary for the embryo to implant after the transfer. There are few serious scientific studies on this subject and, therefore, they have little scientific evidence.
In general, sexual intercourse is usually forbidden in most centers, rather than on the basis of scientific evidence, in order to safeguard the psychological well-being of the couple in case of an undesired outcome. Couples who experience miscarriages or negative outcomes after transfers often look for specific facts and even blame in order to explain the adverse outcome. In many occasions the feeling of guilt is towards the partners, which is tremendously harmful in a fertility process.
