The Compendium of Caraka 6.30.135

6.30.135

ativyavāyadvyāyāmādasātmyānāṃ ca sevanāt/
akāle vā 'apyayonau vā maithunaṃ na ca gacchataḥ//

From excessive sexual intercourse, physical exercise, and use of unwholesome things; / or when practicing coitus at an improper time, in an improper organ, or not [properly];