Hello, I wanted to post this on Nyann's wall with no reason what so ever. But, I decided to make this a shit post because I have nothing better to do. Spoiler
Since i'm a logical person i'm gonna answer this with the best of my ability and knowledge about naruto and sex!. My bet would be that if the sex is good enough, the ecstasy in the H time would be enough to make the clone go puff since a good orgasm can be very demanding in this aspect for your female companion!. But hey if the guy is bad at sex and she just went meh with it! there is still not internal organs for him/her to be pregnant! i hope this is useful for you and as always be away from drugs and go to forums to talk about anime transformation jutsus and sex!