Condom and Rhythm method

Condom noun - Contraceptive device consisting of a sheath of thin rubber or latex that is worn over the penis during intercourse.

Rhythm method and condom are semantically related In some cases you can use "Rhythm method" instead a noun "Condom".

Rhythm method noun - Natural family planning in which ovulation is assumed to occur 14 days before the onset of a period (the fertile period would be assumed to extend from day 10 through day 18 of her cycle).

Condom and rhythm method are semantically related in birth control method topic. You can use "Condom" instead a noun phrase "Rhythm method", if it concerns topics such as pregnancy prevention.