Which types of sexual behavior carry the greatest risk of pregnancy?

There are some types of sexual behavior that creates risk in pregnancy are intercourse without using condom, Single partner relationship, Unprotected mouth-to-genital contact.

Explanation:

Having more partners is considered as sexual risk. Improper use of condoms and usage of drugs before intercourse can also cause risk.

The factors that increase risk are sex without safety measures, intention to have some risky sexual behavior of an infected partner who is not wearing condom has an high risk in getting diseases.