Is it permitted to use pornography as means to arouse yourself toward your spouse?

Shalom u'verachah, One cannot look at pornography even when using it for stimulation with his wife.The reason is based on the Gemara is Nedarim that speaks of 9 bad traits one of them is a child conceived while the husband was thinking of another woman. In the case when pornography is used we are concerned that this will be the case. Kol Tuv