in Zen Buddhism there are no Sexual rites tantras right?

in Zen Buddhism there are no Sexual rites tantras right?

Correct.

Tantric practices are sometimes taught in Tibetan Buddhism (Vajrayana), but are not used in Zen training. However keep in mind that, in Tibetan Buddhism, tartaric practices are not "sexual." Instead, these practices work with desire and aversion for the purpose of spiritual development.

Some Hindu-based traditions employ sexual activities (tantra) as a method for spiritual development. These activities are not part of Buddhism.

http://www.scribd.com/doc/10537125/Zen-and-Tantra

You are right.
No sexual rites tantra. In Zen Buddhism. Zen did neither prohibit sex nor urge it.
Not only sexual rites, Zen Buddhism's ultimate goal is to be free from any rites, or even anything written. So they did not value anything written.
One of the key concept of Zen Buddhism is: "S's??S's", which means "Truth cannot be described in words, There could be different answer other than the doctrine you got"; (You need to find your Answer by yourself only through the sitting meditation by all means, and the Answer is unteachable from any preacher nor senior)?.

Zen Buddhism does not have any tartaric practices.

You can find tartaric practice in Tibetan Buddhism, and there is a sexual aspect to tantra, although it does not mean one should have sex, however one can use sexual energy in tantra in order to transform the energy into developing wisdom.