YOU SAID:

I have never had sexual relations with a horse, only ponies

INTO JAPANESE

私は馬と性的関係を結んだことは一度もありません。

BACK INTO ENGLISH

I have never had sexual relations with horses.

INTO JAPANESE

私は馬と性的関係を持つことは一度もありません。

BACK INTO ENGLISH

I have never had sexual relations with horses.