A couple of thoughts:
1) The vow of perpetual chastity is a heavy, heavy burden for a normal man. Most recent problems have been caused by priests who bear this burden well - because for them abstaining from relations with women is not a burden at all.
2) Fr. Euteneuer has been a giant in a noble cause.
3) Sin is a problem for all of us.
I pray for his healing and, if it is possible, for his restoration to ministry. Hopefully those in the hierarchy who are disgusted by normal relations with women will not be a stumbling block.
I think the Vow of Chastity is intended to include sexual activity with any person -- even one's self, outside of marriage (unfortunately, we need some additional restriction on that last qualifier in some states!). Total sexual abstinence in thought, word, intention and deed.
Good Lord, it probably was no big deal. What did he do? Buy a woman a drink at a bar or write her a love poem? Oy Vey, some people make too big a deal out of everything. Somehow, this screams “Look at me, Look at me! I’m wearing a Hair-Shirt because I thought about a woman sexually.” Give me a break.