2:187 apparently implies that women are NOT OBLIGATED for "masaajid"

[jonny_k]

Peace all,
Permitted for you is sexual intercourse with your wives during the nights of fasting. They are the keepers of your secrets, and you are the keepers of their secrets. GOD knew that you used to betray your souls, and He has redeemed you, and has pardoned you. Henceforth, you may have intercourse with them, seeking what GOD has permitted for you. You may eat and drink until the white thread of light becomes distinguishable from the dark thread of night at dawn. Then, you shall fast until sunset. Sexual intercourse WITH WOMEN(...HUNNA) is prohibited if you decide to retreat to the masjid (during the last ten days of Ramadan). These are GOD's laws; you shall not transgress them. GOD thus clarifies His revelations for the people, that they may attain salvation.
Or alternative more rational IMO translation
Shabbir AHmed (Abstinence is only for the daytime.) It has been made Lawful for you to go unto your wives on the night of the Abstinence. They are your garments and you are their garments close to each other, source of mutual comfort, complementing each other, trustworthy and keepers of privacy, reason for dcor, and redressers of faults. God knows that you would have deprived yourselves and so He turns to you and pardons your misconceptions. So, now you may have intimate relations with them and, besides, seek all good that God has ordained for you. You may eat and drink until you can discern the white streak of light against the black streak of night at daybreak. Then complete the Abstinence until sunset. Do not have intimate relations with them(WOMEN i.e. TUBAASHIROOHUNNA) while on special assignments in the Centers of the Divine System. These are the bounds set by God so come not near violating them. It is thus that God explains His Commands unto mankind clearly, so that they understand and live upright.

So here obviously the address is to MEN ONLY unless we wanna assume that women can also engage with other women in sexual relationships which the Quran nowehere promotes. So i beleive this is only a DUTY for men BUT this does not mean that women cannot join in as some Muslims, unfortunately even M SHaikh in his "Sacred Months lectrue" states. He also, i beleive in the 13/14 part, mentions that women cant because they might menstruate and then theyd have to leave. He still believes menstruating women cannot perform rituals. The problem is even men have seminal fluid leakages especially when they retreat to the masjids for ten days as traditional Muslims practice. GOD Bless!