Which of the following do not block sperm from reaching and fertilising an egg by forming a physical barrier?

Intrauterine devices do not form a physical barrier between the sperm and the ovum. They may increase phagocytosis of sperms, suppress sperm motility and inhibit implantation.

Barrier contraceptives are a type of birth control method that physically block sperm from reaching and fertilising an egg. Examples of barrier contraceptives include condoms, diaphragms, and cervical caps. These methods work by creating a physical barrier between the sperm and the egg, which prevents fertilization from occurring.