uninhibited

US /ˌʌn.ɪnˈhəb.ə.t̬ɪd/
UK /ˌʌn.ɪnˈhəb.ə.t̬ɪd/
1.

free and natural, without embarrassment or too much control:

:
The students we spoke to were surprisingly uninhibited in talking about sex.