Vayikra 18:22 teaches the prohibition of penetrating a man:

וְאֶת-זָכָר — לֹא תִשְׁכַּב, מִשְׁכְּבֵי אִשָּׁה: תּוֹעֵבָה, הִוא.

Thou shalt not lie with mankind, as with womankind; it is abomination.

Vayikra 20:13 teaches the punishment:

וְאִישׁ, אֲשֶׁר יִשְׁכַּב אֶת-זָכָר מִשְׁכְּבֵי אִשָּׁה — תּוֹעֵבָה עָשׂוּ, שְׁנֵיהֶם; מוֹת יוּמָתוּ, דְּמֵיהֶם בָּם.

And if a man lie with mankind, as with womankind, both of them have committed abomination: they shall surely be put to death; their blood shall be upon them.

However, the latter verse seems1 to limit punishment to the case of a man penetrating.

  1. Does the prohibition extend to using implements other than the usual bodypart?

  2. Does a woman penetrating2 count as a) biah, or b) mukas eitz, or c) negiah?

    If a): Is a woman forbidden from penetrating a man mid'oraisa3? Is it punishable too?

    If b) or c): Is a woman forbidden from penetrating a man mid'rabanan, just as with she would be forbidden4 from penetrating a woman?

1. Sanhedrin 54a, could be understood as limiting the prohibition to adults, however, I do not understand why that would need to be specified more than by other mitzvos.
2. With anatomy available through medical condition or, assuming it doesn't halachically change sex, deliberate act.
3. Or is the prohibition limited to only the gender for which it is generally possible. In that case it it missing from the list in Kiddushin 1:7.
4. Kal vachomer from prohibition on intimate touch

  • 2
    I'm not sure what you mean by Mukkat Etz. That usually refers to a woman who has been penetrated, not a woman who penetrates.
    – Double AA
    Dec 26, 2013 at 23:03
  • 2
    You should add a disclaimer that you are assuming the opinion of those who say that sex reassignment surgery does not change halachic gender (see the link DoubleAA posted above).
    – user3318
    Dec 27, 2013 at 2:59
  • 1
    @ray What a terrible kal vahomer. And chazal address stranger cases than this
    – Double AA
    Dec 27, 2013 at 6:46
  • 1
    @ray Probably because we are bad judges of how halachically toeyvah-dik things are (otherwise biah with an infant would be worse than beged ishah, right?).
    – user3318
    Dec 27, 2013 at 7:18
  • 1
    @Malper Not that it isn't worse, just there is no formal specific Torah prohibition.
    – Double AA
    Dec 27, 2013 at 7:20

1 Answer 1


As is always the case for practical questions, consult your Local Orthodox Rabbi.

  • Much of this question is not clear in halacha. Status of female penetration is not clear in halacha. Gender of a woman in situations described in the question is not clear in halacha. Rabbinic ruling in this area is also not clear in halacha. It is very important to ask an Orthodox rabbi for guidance.

Rashi, (Lev 20:13) describes the prohibition as 'entering like a brush into a tube'. This is a euphemism used in the Talmud, (Makkos 7a) to describe the forbidden action. The context of the talmud strongly suggests that only the usual body part is forbidden, on a biblical level, and the Rambam, (Hil' Issurei Biah 1:9,11), explains this action in detail, mentioning only the usual body part. He also codifies the biblical-level prohibition as being between two men, (ibid 1:14).

  • @ray I have edited out any extrapolations that I made.
    – Baby Seal
    Dec 31, 2013 at 20:17
  • 1
    regardless whether it is technically mishkav zachor highly highly doubt any reliable halachic authority would ever permit this. i think there's a tzad (basis) to say it is morally worse and a greater abomination in God's eyes than mishkav zachor since mishkav zachor is one level of unnatural whereas this is 2 levels.
    – ray
    Jan 8, 2014 at 11:01
  • @ray I edited in that these sources only discuss biblical prohibition. Also no longer even addressing parts of the answer that aren't clearly sourced in chazal.
    – Baby Seal
    Jan 8, 2014 at 14:33
  • I still think your attempt at psak was beautiful. Maybe you can include it as a footnote? judaism.stackexchange.com/q/34564/3073
    – Adám
    Jan 12, 2014 at 13:55
  • @NBZ I appreciate that, however, see judaism.stackexchange.com/questions/34217/…, and meta.judaism.stackexchange.com/questions/123/… for the reasons why I feel I can't do that.
    – Baby Seal
    Jan 12, 2014 at 16:44

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