Teenagers who have sex in committed relationships do no worse at school than those who stay virgins, experts have said.

Sex in relationships is largely harmless to academic studies but can have an adverse effect on students who are not romantically involved.

Experts from the University of California Davis and the University of Minnesota in the US looked at teenage experiences of studying and sex.

While previous studies found a negative impact on schooling from having sex, they argued that no research looked at the context in which teenagers sleep together...